Hoval UltraGas 2 User manual

Technical information
Subject to modifi cations | EN
Technical information
Installation instructions
4 220 950 / 02 - 05/23
Hoval products must be installed and commissioned by
specialists only. These instructions are intended exclu-
sively for the specialist. Electrical installation must be
performed by a licenced electrical company.
Floor-standing gas condensing boilers
UltraGas® 2 (125-1550) acc. to EN 15502-1/15502-2-1
are suitable and licenced for use as heat generators
for hot water heating systems with a permissible ow
temperature of up to 95 °C1). They are designed for
continuously controlled reduced operation in heating
systems.
1) See technical data
UltraGas®2 (125-1550)
Floor-standing gas condensing boiler
These instructions are applicable to the fol-
lowing types:
Nominal output ranges at 50/30 °C and
natural gas
52-UltraGas®2 (125) 25-126 kW
52-UltraGas®2 (150) 35-151 kW
52-UltraGas®2 (190) 38-191 kW
52-UltraGas®2 (230) 51-233 kW
52-UltraGas®2 (300) 58-299 kW
52-UltraGas®2 (350) 70-352 kW
52-UltraGas®2 (400) 69-399 kW
52-UltraGas®2 (450) 77-451 kW
52-UltraGas®2 (500) 77-491 kW
52-UltraGas®2 (530) 110-533 kW
52-UltraGas®2 (620) 136-622 kW
52-UltraGas®2 (700) 146-703 kW
52-UltraGas®2 (800) 166-804 kW
52-UltraGas®2 (1000) 205-999 kW
52-UltraGas®2 (1100) 229-1112 kW
52-UltraGas®2 (1300) 269-1320 kW
52-UltraGas®2 (1550) 324-1550 kW
52-UltraGas®2 H (700) 146-703 kW
52-UltraGas®2 H (1100) 229-1112 kW
52-UltraGas®2 H (1550) 324-1550 kW

24 220 950 / 02
TABLE OF CONTENTS
1. Important notices
1.1 System manual ....................................................................................................................................................................4
1.2 General safety instructions.................................................................................................................................................4
1.3 Explanation of the symbols ................................................................................................................................................5
1.3.1 Warnings ..........................................................................................................................................................................5
1.3.2 Warning symbols...............................................................................................................................................................5
1.3.3 Information........................................................................................................................................................................6
1.4 On delivery...........................................................................................................................................................................6
1.5 Transport..............................................................................................................................................................................6
1.6 Guarantee ............................................................................................................................................................................6
1.7 Regulations, standards and directives...............................................................................................................................7
2. Technical information
2.1 Description ..........................................................................................................................................................................8
2.1.1 Function descriptions ........................................................................................................................................................9
2.1.1.1 Automatic function device BIC 970 (brief description) .......................................................................................................................9
2.2 Technical data....................................................................................................................................................................10
2.2.1 Meaning of the data on the data plate .............................................................................................................................10
2.2.2 Technical data UltraGas®2 (125-1550)............................................................................................................................ 11
2.2.3 Heating water side flow resistance ..................................................................................................................................16
2.3 Dimensions........................................................................................................................................................................17
2.3.1 UltraGas®2 (125-1550) dimensions ................................................................................................................................17
2.3.2 Overall unit dimensions...................................................................................................................................................18
2.3.3 Space requirement..........................................................................................................................................................19
2.3.3.1 Installation variants with reduced height requirements ....................................................................................................................20
3. Installation
3.1 Installation location (requirements on the boiler room) ..................................................................................................21
3.2 Setting up heat generator .................................................................................................................................................22
3.2.1 Requirements for installation and setting up....................................................................................................................22
3.2.1.1 Suspension option ..........................................................................................................................................................................22
3.2.2 Set-up of UltraGas®2 (125,150)......................................................................................................................................23
3.2.3 Set-up of UltraGas®2 (190-1550)....................................................................................................................................24
3.3 Installing thermal insulation .............................................................................................................................................25
3.4 Mounting cladding.............................................................................................................................................................26
3.5 Removing the cladding for maintenance and service work.............................................................................................32
4. Installation
4.1 Combustion air supply ......................................................................................................................................................34
4.1.1 Operation dependent and independent of room air..........................................................................................................34
4.1.1.1 Room air dependent installation
(construction B) ..............................................................................................................................................................................34
4.1.1.2 Installation independent of room air
(construction C)..............................................................................................................................................................................34
4.2 Flue gas connection, flue gas line....................................................................................................................................35
4.2.1 Standard values for flue gas line dimensions...................................................................................................................36
4.2.2 Combustion air/flue gas ducting ......................................................................................................................................38
4.3 Condensate drain line .......................................................................................................................................................39
4.3.1 Condensate drain engineering guidelines........................................................................................................................39
4.3.2 Installing siphon and condensate drain line.....................................................................................................................41
4.3.2.1 Installing condensate drain line siphon – sewer system (standard design) ......................................................................................41
4.3.2.2 Installing condensate drain line siphon – condensate pump – sewer system at higher level ............................................................42
4.3.2.3 Installing the condensate drain line siphon – neutralisation unit – sewer system .............................................................................43
4.3.2.4 Installing the condensate drain line siphon – neutralisation unit – condensate pump – sewer system at higher level.......................44
4.4 Gas connection..................................................................................................................................................................45
4.4.1 Venting the gas line ........................................................................................................................................................46
4.4.2 Checking the gas supply .................................................................................................................................................46

34 220 950 / 02
TABLE OF CONTENTS
4.5 Hydraulic connection ........................................................................................................................................................47
4.5.1 Hydraulic integration .......................................................................................................................................................48
4.5.1.1 Heat generator cascades................................................................................................................................................................49
4.5.2 Water quality in heating systems.....................................................................................................................................50
4.5.3 Filling the heating system................................................................................................................................................52
4.6 Electrical connection.........................................................................................................................................................52
4.6.1 Safety precaution for installation in line with EMC requirements......................................................................................54
4.6.2 Recommended cable cross-sections and maximum permitted cable lengths ...................................................................56
5. Commissioning
5.1 Prerequisites for trial operation........................................................................................................................................57
5.2 Commissioning procedure................................................................................................................................................58
5.3 Switching the heat generator on.......................................................................................................................................59
5.4 Checking the parameter settings......................................................................................................................................59
5.5 Checking the gas flow pressure .......................................................................................................................................59
5.6 Functional check of pressure monitoring device.............................................................................................................59
5.6.1 Checking the function of the pressure switch (safety check)............................................................................................59
5.7 Changing the heat generator to a different type of gas...................................................................................................60
5.8 Performing the emission measurement and adjusting the gas quantity ........................................................................60
5.8.1 Performing the emission measurement for UltraGas®2 (125-700) ...................................................................................61
5.8.2 Performing the emission measurement for UltraGas®2 (800-1550) .................................................................................62
5.9 Monitoring work before handover to the operator...........................................................................................................64
5.10 Heat generator handed over to the operator....................................................................................................................64
6. Maintenance
6.1 Maintenance work..............................................................................................................................................................66
6.2 Bleeding the heating system.............................................................................................................................................67
6.3 Replenishing replacement water ......................................................................................................................................67
6.4 Information for fire inspector / chimney sweep regarding emission and manual operation settings ...........................68
6.5 Cleaning and maintaining the heat generator ..................................................................................................................69
6.6 Servicing motorised combustion air damper (option) .....................................................................................................76
6.7 Renewing fuse ...................................................................................................................................................................78
6.8 Monitoring work before handover to the operator...........................................................................................................79
7. Decommissioning
7.1 Disconnecting the heat generator from the mains...........................................................................................................80
8. Appendix
8.1 BIC 970 automatic function device parameter list ...........................................................................................................81
8.1.1 Automatic function device UltraGas®2 ............................................................................................................................81
8.2 Activate screed function ...................................................................................................................................................83

44 220 950 / 02
IMPORTANT NOTICES
1. Important notices
1.1 System manual
All instructions relevant to your plant can be found in the
Hoval system manual – please keep all manuals. In ex-
ceptional cases, the instructions can be found with the
components.
Further sources of information:
• Hoval catalogue
• Standards, regulations
1.2 General safety instructions
The system may only be placed in operation
if all the relevant standards and safety regula
-
tions have been complied with.
However, at least the following conditions must be satis-

• Safety valve is installed (system sealed).
• Heating control is operating (on the electrical mains).
• 
- Heating system
- Siphon
- 
• The following are connected to the heat generator:
- Sensor for safety temperature limiter connected
(= boiler temperature sensor)
- Diaphragm pressure expansion tank
- 
-
let of the heat generator)
• The burner is preset.
!
WARNING
Qualication for works
If work is carried out by non-expert persons,
this can result in damage to property and
personal injury.
• 
adequately trained, instructed and informed
about the dangers and risks associated with
the product) are allowed to carry out the
work in question.
•
This heat generator must not be used by
persons (including children) with limited
physical, sensory or mental capabilities or
󰀩-
less they are supervised or detailed instruc-
tion is given for use of the heat generator by
a person responsible for the safety of such
persons.
WARNING
Fuel gas leak
Danger of explosion if there is a fuel gas leak.
• If you smell gas:
- Do not smoke
- 
- Avoid the occurrence of sparks
- Do not switch on the light or other electri-
cal appliances
- Open windows and doors
- 󰀨
󰀨
- Leave the room
- Notify the specialist gas company/heat-
ing installation company
- Follow the safety regulations on the gas
meter
WARNING
Flue gas leak

• 
- 󰀨
- Open windows and doors
- Leave the room
- Notify the heating installation company
WARNING
Hot surfaces
If cladding parts are dismantled and/or the
boiler door is open, there is a risk of burns
from touching hot surfaces.
• 󰀩-
ciently before working (at least 20 minutes)
or wear heat-resistant protective gloves.
NOTICE
Filling and replacement water
-
authorised liquids.
• 
carried out by a heating installer.
• 
of the required water quality (see chapter
4.5.2).
•
Only chemical additives for which the
    
safety and suitability are allowed to be
used.
•
If frost protection agent is being used, a
separate engineering sheet is available
from Hoval.

54 220 950 / 02
IMPORTANT NOTICES
CAUTION
Sharp edges
         
parts of the cladding have been dismantled
and/or the boiler door is open, there is a risk
of cuts from sharp edges.
•
Handle parts of the cladding carefully and
wear protective gloves.
• Avoid contact with sharp edges.
• -
ishing the work.
WARNING
The heat generator can only be de-energised
by disconnection from the mains (e.g. all-
pole switch).
WARNING
All electrical power supply circuits must be
󰀨
!
WARNING
The boiler must only be suspended using the
four points marked as the crane suspension
option in Fig. 02. The hooks on the rear of the
boiler must not be used to suspend it.
1.3 Explanation of the symbols
1.3.1 Warnings
!
DANGER
... indicates an imminently hazardous situa-
tion which, if not avoided, will result in death
or serious injury.
!
WARNING
... indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
!
CAUTION
... indicates a possible hazardous situation
which, if not avoided, could result in a minor
or moderate injury.
NOTICE
... indicates a possible risk situation which, if
not avoided, could result in property damage.
1.3.2 Warning symbols
The following warning symbols are combined with signal
words CAUTION, WARNING and DANGER for the warn-
ing notes.
!
General warning symbols
Warning of electrical voltage
Warning of hot surface
Warning of potentially explosive substances
Warning of harmful or irritating substances
Warning of cutting injuries

64 220 950 / 02
IMPORTANT NOTICES
1.3.3 Information
Information:
Provides important information.
Tool:
Indicates which tool you will need for the next
work step.
§
Provides important information. Refers to
standards and directives.
Read the operating instructions before instal
-
lation and commissioning.
Read the installation instructions before in
-
stallation.
1.4 On delivery
Carry out a visual inspection immediately on receiving the
heat generator. If any damage is found, take the neces-
-
tive risk carrier bears the cost of repairs.
1.5 Transport
• On receipt of the heat generator, please remove the
packaging and check that the delivery is complete, con-
sistent with your order and has not been damaged in
transit.
• The heat generator must be transported and stored
safely and protected from damage.
• Interim storage of Hoval condensing boilers may only
take place in locations protected against the elements
and against damage.
• The ambient conditions during storage must comply
with the following limit values:
- Air temperature: -10 °C - +50 °C
- Air humidity: 50-80 % relative humidity
- Condensation-free
1.6 Guarantee
The guarantee does not cover defects attributable to:
• Malfunctions and damage caused by installation in un-
suitable rooms, e.g. hobby rooms, workshops, etc.
• Failure to follow the installation instructions
• Failure to comply with the operating instructions
• Incorrect installation
• 
• Incorrect handling
• Contaminated operating media (fuel gas, heating wa-
ter, combustion air)
• Unsuitable chemical additives to the heating water
• Damage caused by the application of force
• Corrosion by halogen compounds (e.g. paints, adhe-
sives, solvents, cleansing agent)
• Corrosion caused by not observing the required water
quality (see chapter 4.5.2)

74 220 950 / 02
IMPORTANT NOTICES
1.7 Regulations, standards and directives
The locally applicable heating system regulations must
be followed when planning, installing and operating the
gas heat generator:
• The regulations of the local building authorities, insur-
ance companies, chimney sweeps and the state/can-
ton etc. must also be taken into account.
• The regulations of the responsible gas supply company
are to be complied with if using gas.
• Regulations governing the discharge and treatment of

water authorities.
• Approval by the authorities may be required for instal-
lation.
The standards, guidelines and ordinances listed for the
-
eration of the gas heat generator. The list is intended as
an aid. It is not complete. The currently applicable regula-
tions must be observed.
Countries of destination §
For the countries of destination, the locally applicable

a few examples:
Germany §
• DIN EN 12828 Heating systems in buildings – Design
of hot water heating systems
• 󰀩
for calculation of the design heat load
• DIN EN 13384 Flue gas systems – Calculation meth-

• DIN EN 14868: Protection of metallic materials against
corrosion – Guidance on the assessment of corrosion
likelihood in closed water circulation systems
• DIN EN 50156; VDE 0116 Electrical equipment of
combustion plants and associated facilities
• DIN VDE 0100 Erection of low-voltage installations
(for electrical installation and the TAB (technical con-
nection requirements of the relevant energy supply
company))
• VDI 2035 Prevention of damage in hot water/heating
systems by corrosion and the formation of scale in
closed hot water heating systems.
• Rules for gas established by DVGW (in particular
DVGW-TRGI Technical rules for gas installations)
• Firing ordinance of the federal states
• 
• Worksheet DWA-A 251 Condensate from condensing
boilers
The regulations of the local water authorities could
deviate from the rules in this worksheet.
• Accident prevention regulations
- DGUV Regulation 1 Accident prevention regulations
– Guidelines for prevention
- DGUV Regulation 4 Accident prevention regulations
– Electrical installations and equipment
Austria §
• ÖNORM EN 12828 Heating systems in buildings –
Design of hot water heating systems
• 󰀩
Method for calculation of the design heat load
• 
calculation methods
• ÖNORM EN 14868: Protection of metallic materials
against corrosion – Guidance on the assessment of
corrosion likelihood in closed water circulation systems
• OVE EN 50156: Electrical equipment for furnaces and
ancillary equipment
• 
• ÖNORM H 5170 Heating systems – Requirements

environmental protection
•  -
nology – Prevention of damage by corrosion and the
formation of scale in closed hot water heating systems
• ÖVGW rules for gas
• 
• SNT regulations
Switzerland §
• SN EN 12828+A1;SIA 384.101+A1 Heating systems in
buildings – Design of hot water heating systems
• 󰀩
for calculation of the design heat load
• SN EN 13384;SIA 384.42x Flue gas systems – Heat

• SN EN 14868: Protection of metallic materials against
corrosion – Guidance on the assessment of corrosion
likelihood in closed water circulation systems
• SN EN 50156: Electrical equipment of combustion
plants and associated facilities
• SWKI 91-1 Aeration and ventilation of the boiler room
• SWKI HE301-01 Safety engineering installations for
heating systems
• SWKI BT102-01 Water quality for building services
systems
• SVGW rules for gas
• 
(Association of Cantonal Fire Insurers)
• 
• Water Protection Regulation (GSchV)
• EKAS – Guidelines for liquid gas

84 220 950 / 02
TECHNICAL INFORMATION
2. Technical information
2.1 Description
The UltraGas®2 is a low-pollution and energy-saving
gas condensing boiler with the Ultraclean burner system,
        
UltraGas®2 has a vertically arranged combustion
chamber of stainless steel as the primary heating surface
and a secondary heating surface of TurboFer®stainless
steel composite pipes (stainless steel on the water side,
stainless steel/aluminium on the heating gas side).
The secondary heating surface is designed so that part

and the heat of evaporation is utilised for the heating cir-

can be swivelled up easily for maintenance work.
UltraGas®2 is approved for burning the following fuels:
• Natural gas E
• Natural gas E with a hydrogen content (H2) of up to 20 %
• Natural gas LL
• Propane according to DIN 51622
• Biomethane according to EN 16723
The UltraGas®2 corresponds with the stand
-
ards and guidelines listed in the EU decla
-
ration of conformity/UK declaration of con
-
formity. The EU declaration of conformity/
UK declaration of conformity belonging to the
product is found in the system book.
Flow
High-temperature return
Low-temperature return
Gas valve
Combustion air fan
Ignition electrode and
ionisation electrode
TurboFer® heat exchanger
TopTronic®E heating
control
Flue gas outlet
Condensate drip tray
Fig. 01

94 220 950 / 02
TECHNICAL INFORMATION
2.1.1 Function descriptions
2.1.1.1 Automatic function device BIC 970 (brief description)
The automatic function device BIC 970 of the UltraGas®2
is only used in conjunction with the heating control Top-
Tronic®E/UltraGas®2, which means many familiar func-
tions are already provided by the latter. Consequently,
only the features which are integrated in the automatic
function device are mentioned here:
- PWM control of the fan
- Modulating operation
- 
- Optional ignition monitoring via UV sensor
- Main gas valve (possibly LPG valve) or boiler room fan
can be controlled
- Inputs for:
- Flow sensor 1
- Flow sensor 2
- Flue gas sensor
- Water pressure sensor
-       
gas temperature monitor)
- Air pressure switch
- Optional air pressure sensor can be connected for
monitoring
- Gas pressure switch
- 
- “Fault” and “Flame message” status outputs
- RS485 connection to TopTronic®E/UltraGas®2
- Number of start attempts: maximum 4
- Safety time: 5 sec. (UltraGas®2 (1300,1550): 3 sec.)
- Pre-ignition: 5 sec.
- Pre-ventilation period: 50 sec.
- After-run time for pump (230 V AC): 5 min after a heat
demand
Occurrence of a malfunction
A possible malfunction is displayed on the control module
by means of error code and plain text. In addition, the
lamp on the control module and, if necessary, on the fault
signalling lamp of the control panel adapter also lights up.
There is also a reset button on the control panel adapter
with which the heat generator can be put back into opera-

Fuses
There is a slow-blow fuse on the BIC 970: 10 A

10 4 220 950 / 02
TECHNICAL INFORMATION
2.2 Technical data
2.2.1 Meaning of the data on the data plate
6
7
10
11
3
4
5
12
8
9
1
2
Hersteller / Fabricant
Produttore / Manufacturer
Vertrieb Hoval AG CH-8706 Feldmeilen
Hoval Gesellschaft mbH A-4614 Marchtrenk
Hoval Ltd. GB-Newark NG24 1JN
Distrib. Hoval s.r.l. I-24050 Zanica Hoval d.o.o. HR-10250 Lučko Hoval EOOD BG-1797 Sofia
Vendita Hoval GmbH D-85609 Aschheim Hoval SK spol. s r.o. SK-040 01 Košice Hoval Oriental Beijing CN-100120
Sale Hoval spol. s r.o. CZ-312 04 Plzen Hoval s.r.l. RO-Voluntari 077190, Jud IIfov
Hoval SAS F-67118 Geispolsheim Hoval Sp. Z.o.o. PL-62-002 Suchy Las
Modell / Modèle
Modelli / Model
Brennwertkessel
Chaudière à condensation
Caldaia a condensazione
Condensing boiler
Pn
Pn (80/60°C)
Pn (50/30°C)
(1.5 x PMS)
Qn (H
i
)
Qn (Hs)
Anschlussart / Kind of contact / Type de raccordement / Tipo de collegamento
eingestellte Gasart / Réglage pour gaz / Tipo di gas previsto / Supplied for gastype / pmin
mbar mbar
mbar mbar
mbar mbar
mbar mbar
mbar mbar
mbar mbar
mbar mbar
mbar mbar
Elektroanschluss / Raccordement électrique / Collegamento elettrico / Electrical Connection
NOx-Klasse / Classe NOx / Classe NOx / NOx-class
-
UKCA-No:
Hoval Aktiengesellschaft FL-9490 Vaduz
UltraGas® 2 (230) 09/2022
230
kW
V (H
2
O)
l
265
47 - 218
kW PMS
6
bar
51 - 233
kW
PT
9
bar
47 - 223
kW
Tmax
95
°C
52 - 247
kW
TS
110
°C
CY, MT
30/50
20
B23,B23P,C53,C63
Erdgas H/18 mbar
BE
20/25, 37
20, 37
PL
II2ELw3P
NO, MK
I2H
AT
20, 50
20, 50
DE
NL
LU
II2E3P
II2EK3P
20/25, 50, 50
II2H3P
GB, GR, IE, IS
20, 37
20/25, 37
CH, CZ, BA, BG
20, 37
20/25, 30
HU
II2HS3P
FR
II2Er3P / IIEsi3P
II2H3P
II2H3P
IT, LT, LI, PT
20, 37
20, 30
SI, SK, TR, UA
20, 37
EE, DK, SE, RS, ME
II2H3B/P
FI, HR, RO, RU
II2H3P
II2H3P
20, 30
II2E(R)3P / II2E(S)3P
I3P
II2ELL3P
20, 50
II2H3P
230V~/ 50Hz/ 16A , IP20
max. 228 W
EN 15502
CE-Nr. / N° CE / Numero-CE / CE-No
CE-0085DL0175
SVGW-Nr. / SVGW-No. / Nº-SVGW / N. -SVGW
20-010-4
1Manufacturer
2Subsidiaries
3Boiler type (left) and production date (right)
4Boiler type (left) and serial No. (right)
5Performance features:
• Pn Boiler nominal heat output
• Pn (80/60 °C) Nominal heat output at 80/60 °C
• Pn (50/30 °C) Nominal heat output at 50/30 °C
• Qn (NCV) 
NCV)
• Qn (GCV) 
GCV)
• V (H2O) Boiler water content (V(H2O))
• PMS Max. heating operating pressure (PMS)
• PT Test pressure (PT)
• Tmax Operating temperature max. (Tmax)
• TS Safety temperature (TS)
6Boiler construction type
7Type of gas set
8Gas supply pressure depending on the gas device category and
the country of destination
• Column 1: Country of destination
• Column 2: Gas device category
• Column 3: Gas supply pressure
9Electric supply
• Nominal voltage / Type of supply
• Type of protection
• Max. power consumption
10 NOx class and authoritative standard
11 Product ID number / Registration number
12 Read and comply with the labels and warning notice, installation
instructions and operating instructions

114 220 950 / 02
TECHNICAL INFORMATION
2.2.2 Technical data UltraGas®2 (125-1550)
Type (125) (150) (190) (230)
• Nominal heat output at 80/60 °C, natural gas 1) kW 21-114 33-139 35-177 47-218
• Nominal heat output at 50/30 °C, natural gas 1) kW 25-126 35-151 38-191 51-233
• Nominal heat output at 80/60 °C, propane 2) kW 27-113 43-138 55-175 81-217
• Nominal heat output at 50/30 °C, propane 2) kW 30-126 48-151 62-191 90-233
• Nominal heat input with natural gas 3) kW 23-116 32-142 35-179 47-223
• Nominal heat input with propane 2) kW 28-116 44-142 57-179 84-223
• Operating pressure heating min./max. (PMS) bar 1/6 1/6 1/6 1/6
• Operating temperature max. (Tmax) °C 95 95 95 95
• Boiler water content (V(H20)) l 207 195 276 265
• Flow resistance boiler see diagram
• Minimum circulation water quantity l/h - - - -
• Boiler weight (without water capacity, incl. cladding) kg 378 400 490 510
•󰀩4) % 98.6/88.9 97.6/88.1 98.5/ 88.7 98.2/88.5
•󰀩4) %108.7/98.1 108.7/98.1 109.0/98.2 108.4/97.8
•󰀩
- without control  % 93 93 93 93
- with control  % 95 95 95 95
- with control and room sensor  % 97 97 97 97
- annual energy consumption QHE BY 209 265 326 412
• NOx class (EN 15502) - - - -
• Nitrogen oxide emissions (EN 15502) (GCV) NOx mg/kWh 25 28 33 37
• Carbon monoxide emissions at 50/30 °C (in relation to 3 % O2) CO mg/Nm331 21 25 13
• O2 % 5.9/5.6 5.5/6.0 5.9/6.0 6.0/5.9
• Heat loss in standby mode Watt 380 380 510 510
• Dimensions see dimensional drawing
•
- Natural gas E/LL mbar 17.4-80 17.4-80 17.4-80 17.4-80
- Propane mbar 37-57 37-57 37-57 37-57
• Gas inlet pressure max. (idle pressure) mbar 80 80 80 80
• Gas connection values at 15°C/1013 mbar:
- Natural gas E - (Wo = 15.0 kWh/m3) NCV = 9.7 kWh/m3m3/h 2.4-12.0 3.3-14.6 3.6-18.5 4.8-23.0
- Natural gas LL (G25) - (Wo = 12.4 kWh/m3) NCV = 8.13 kWh/m3m3/h 2.8-14.3 3.9-17.5 4.3-22.0 5.8-27.4
- Propane (G31) - NCV = 24.4 kWh/m32) m3/h 1.2-4.8 1.8-5.8 2.3-7.3 3.4-9.1
• Operating voltage V/Hz 1x230/50 1x230/50 1x230/50 1x230/50
• Electrical power consumption min./max. Watt 41/140 43/225 38/151 49/228
• Standby Watt 7 8 8 8
• Type of protection IP 20 20 20 20
• Permitted ambient temperature during operation °C 5-40 5-40 5-40 5-40
• Sound power level
- Heating noise (EN 15036 part 1) (room air dependent) dB(A) 64 69 63 66
- Flue gas noise radiated from the mouth
(DIN 45635 part 47) (room air dependent/independent of room air)
dB(A) 69 70 66 68
- Sound pressure level heating noise (standard value depending on installation
conditions)
dB(A) 54 59 53 56
• Condensate quantity (natural gas) at 50/30 °C l/h 11 12 15 20
• pH value of the condensate (approx.) ph 4.2 4.2 4.2 4.2
• Construction B23, B23P, C53, C63
• Flue gas system
- Temperature class T120 T120 T120 T120
-  kg/h 188 226 283 344
-  kg/h 37 51 55 63
- Flue gas temperature at max. nominal heat output and 80/60 °C °C 64 65 68 69
- Flue gas temperature at max. nominal heat output and 50/30 °C °C 43 45 46 47
- Flue gas temperature at min. nominal heat output and 50/30 °C °C 29 28 29 29
- Max. permissible temperature of the combustion air °C 48 48 48 48
-  Nm3/h 154 180 232 280
-  Pa 120 120 130 130
-  Pa -50 -50 -50 -50
1) In relation to natural gas G20 (100 % methane). With a hydrogen content (H2) of up to 20 % in accordance with DVGW ZP3100 (D), an output
reduction of up to 7 % is possible.
2) Data related to NCV, conditional data
3) Data related to NCV. The boiler series is tested for EE/H setting. With a factory setting to a Wobbe value of 15.0 kWh/m3, operation in the Wob-
be value range from 12.0 to 15.7 kWh/m3is possible without resetting.
4) Conversion acc. to EN 15502-1, Appendix J

12 4 220 950 / 02
TECHNICAL INFORMATION
Type (300) (350) (400) (450)
• Nominal heat output at 80/60 °C, natural gas 1) kW 54-274 67-315 62-362 73-415
• Nominal heat output at 50/30 °C, natural gas 1) kW 58-299 70-352 69-399 77-451
• Nominal heat output at 80/60 °C, propane 2) kW 83-274 115-311 97-361 111-408
• Nominal heat output at 50/30 °C, propane 2) kW 93-299 129-352 108-399 122-451
• Nominal heat input with natural gas 3) kW 54-282 64-331 62-374 71-427
• Nominal heat input with propane 2) kW 87-282 121-331 100-374 115-427
• Operating pressure heating min./max. (PMS) bar 1/6 1/6 1/6 1/6
• Operating temperature max. (Tmax) °C 95 95 95 95
• Boiler water content (V(H20)) l 472 452 432 412
• Flow resistance boiler see diagram
• Minimum circulation water quantity l/h - - - -
• Boiler weight (without water capacity, incl. cladding) kg 770 810 830 840
•󰀩4) % 98.2/88.5 98.2/88.5 98.2/88.5 98.2/88.5
•󰀩4) %109.2/98.4 108.9/98.1 109.0/98.2 108.9/98.1
•󰀩
- without control  %94 93 93 -
- with control  %96 95 95 -
- with control and room sensor  %98 97 97 -
- annual energy consumption QHE BY 505 590 653 -
• NOx class (EN 15502) - - - 6
• Nitrogen oxide emissions (EN 15502) (GCV) NOx mg/kWh 39 45 39 45
• Carbon monoxide emissions at 50/30 °C (in relation to 3 % O2) CO mg/Nm318 26 23 30
• O2 % 5.5/5.8 5.7/5.7 5.9/5.9 6.0/5.6
• Heat loss in standby mode Watt 750 750 750 750
• Dimensions see dimensional drawing
•
- Natural gas E/LL mbar 17.4-80 17.4-80 17.4-80 17.4-80
- Propane mbar 37-57 37-57 37-57 37-57
• Gas inlet pressure max. (idle pressure) mbar 80 80 80 80
• Gas connection values at 15°C/1013 mbar:
- Natural gas E - (Wo = 15.0 kWh/m3) NCV = 9.7 kWh/m3m3/h 5.6-29.1 6.6-34.1 6.4-38.6 7.3-44.0
- Natural gas LL (G25) - (Wo = 12.4 kWh/m3) NCV = 8.13 kWh/m3m3/h 6.6-34.7 7.9-40.7 7.6-46.0 8.7-52.5
- Propane (G31) - NCV = 24.4 kWh/m32) m3/h 3.6-11.6 5.0-13.6 4.1-15.3 4.7-17.5
• Operating voltage V/Hz 1x230/50 1x230/50 1x230/50 1x230/50
• Electrical power consumption min./max. Watt 51/365 55/350 56/518 56/590
• Standby Watt 5 5 5 5
• Type of protection IP 20 20 20 20
• Permitted ambient temperature during operation °C 5-40 5-40 5-40 5-40
• Sound power level
- Heating noise (EN 15036 part 1) (room air dependent) dB(A) 73 70 73 74
- Flue gas noise radiated from the mouth
(DIN 45635 part 47) (room air dependent/independent of room air)
dB(A) 71 72 73 74
- Sound pressure level heating noise (standard value depending on installation
conditions)
dB(A) 63 60 63 64
• Condensate quantity (natural gas) at 50/30 °C l/h 22 25 28 29
• pH value of the condensate (approx.) ph 4.2 4.2 4.2 4.2
• Construction B23, B23P, C53, C63
• Flue gas system
- Temperature class T120 T120 T120 T120
-  kg/h 445 522 591 674
-  kg/h 85 101 98 112
- Flue gas temperature at max. nominal heat output and 80/60 °C °C 64 65 66 67
- Flue gas temperature at max. nominal heat output and 50/30 °C °C 43 44 48 47
- Flue gas temperature at min. nominal heat output and 50/30 °C °C 29 29 29 29
- Max. permissible temperature of the combustion air °C 48 48 48 48
-  Nm3/h 364 428 483 552
-  Pa 130 130 130 130
-  Pa -50 -50 -50 -50
1) In relation to natural gas G20 (100 % methane). With a hydrogen content (H2) of up to 20 % in accordance with DVGW ZP3100 (D), an output
reduction of up to 7 % is possible.
2) Data related to NCV, conditional data
3) Data related to NCV. The boiler series is tested for EE/H setting. With a factory setting to a Wobbe value of 15.0 kWh/m3, operation in the Wob-
be value range from 12.0 to 15.7 kWh/m3is possible without resetting.
4) Conversion acc. to EN 15502-1, Appendix J

134 220 950 / 02
TECHNICAL INFORMATION
Type (500) (530) (620) (700)
• Nominal heat output at 80/60 °C, natural gas 1) kW 71-449 100-497 125-580 132-653
• Nominal heat output at 50/30 °C, natural gas 1) kW 77-491 110-533 136-622 146-703
• Nominal heat output at 80/60 °C, propane 2) kW 111-441 137-489 168-569 174-643
• Nominal heat output at 50/30 °C, propane 2) kW 121-491 145-533 178-622 187-703
• Nominal heat input with natural gas 3) kW 71-463 101-506 124-591 134-668
• Nominal heat input with propane 2) kW 115-463 141-506 174-591 180-668
• Operating pressure heating min./max. (PMS) bar 1/6 1/6 1/6 1/6
• Operating temperature max. (Tmax) °C 95 95 95 95
• Boiler water content (V(H20)) l 408 571 536 509
• Flow resistance boiler see diagram
• Minimum circulation water quantity l/h - - - -
• Boiler weight (without water capacity, incl. cladding) kg 850 978 1050 1100
•󰀩4) % 98.2/88.5 98.2/88.5 98.2/88.5 98.2/88.5
•󰀩4) %109.0/98.2 109.1/98.3 109.0/98.2 108.9/98.1
•󰀩
- without control  % ----
- with control  % ----
- with control and room sensor  % ----
- annual energy consumption QHE BY - - - -
• NOx class (EN 15502) 6 6 6 6
• Nitrogen oxide emissions (EN 15502) (GCV) NOx mg/kWh 50 33 33 40
• Carbon monoxide emissions at 50/30 °C (in relation to 3 % O2) CO mg/Nm346 20 24 26
• O2 % 5.5/5.8 5.9/5.9 5.9/6.0 6.0/5.7
• Heat loss in standby mode Watt 750 1000 1000 1000
• Dimensions see dimensional drawing
•
- Natural gas E/LL mbar 17.4-80 17.4-80 17.4-80 17.4-80
- Propane mbar 37-57 37-57 37-57 37-57
• Gas inlet pressure max. (idle pressure) mbar 80 80 80 80
• Gas connection values at 15°C/1013 mbar:
- Natural gas E - (Wo = 15.0 kWh/m3) NCV = 9.7 kWh/m3m3/h 7.3-47.7 10.4-52.2 12.8-60.9 13.8-68.9
- Natural gas LL (G25) - (Wo = 12.4 kWh/m3) NCV = 8.13 kWh/m3m3/h 8.7-56.9 12.4-62.2 15.3-72.7 16.5-82.2
- Propane (G31) - NCV = 24.4 kWh/m32) m3/h 4.7-19.0 5.8-20.7 7.1-24.2 7.4-27.4
• Operating voltage V/Hz 1x230/50 1x230/50 1x230/50 1x230/50
• Electrical power consumption min./max. Watt 57/716 67/805 63/831 67/1060
• Standby Watt 5 5 5 5
• Type of protection IP 20 20 20 20
• Permitted ambient temperature during operation °C 5-40 5-40 5-40 5-40
• Sound power level
- Heating noise (EN 15036 part 1) (room air dependent) dB(A) 78 77 75 76
- Flue gas noise radiated from the mouth
(DIN 45635 part 47) (room air dependent/independent of room air)
dB(A) 77 70 72 71
- Sound pressure level heating noise (standard value depending on installation
conditions)
dB(A) 68 67 65 66
• Condensate quantity (natural gas) at 50/30 °C l/h 37 39 51 48
• pH value of the condensate (approx.) ph 4.2 4.2 4.2 4.2
• Construction B23, B23P, C53, C63
• Flue gas system
- Temperature class T120 T120 T120 T120
-  kg/h 736 800 933 1055
-  kg/h 112 159 196 211
- Flue gas temperature at max. nominal heat output and 80/60 °C °C 66 67 68 69
- Flue gas temperature at max. nominal heat output and 50/30 °C °C 44 45 47 49
- Flue gas temperature at min. nominal heat output and 50/30 °C °C 28 28 28 29
- Max. permissible temperature of the combustion air °C 48 48 48 48
-  Nm3/h 602 654 764 863
-  Pa 130 130 130 130
-  Pa -50 -50 -50 -50
1) In relation to natural gas G20 (100 % methane). With a hydrogen content (H2) of up to 20 % in accordance with DVGW ZP3100 (D), an output
reduction of up to 7 % is possible.
2) Data related to NCV, conditional data
3) Data related to NCV. The boiler series is tested for EE/H setting. With a factory setting to a Wobbe value of 15.0 kWh/m3, operation in the Wob-
be value range from 12.0 to 15.7 kWh/m3is possible without resetting.
4) Conversion acc. to EN 15502-1, Appendix J

14 4 220 950 / 02
TECHNICAL INFORMATION
Type (800) (1000) (1100) (1300)
• Nominal heat output at 80/60 °C, natural gas 1) kW 150-743 185-926 203-1038 241-1230
• Nominal heat output at 50/30 °C, natural gas 1) kW 166-804 205-999 229-1112 269-1320
• Nominal heat output at 80/60 °C, propane 2) kW 233-744 245-926 299-1033 362-1227
• Nominal heat output at 50/30 °C, propane 2) kW 254-804 264-999 316-1112 385-1320
• Nominal heat input with natural gas 3) kW 151-759 187-943 206-1057 247-1251
• Nominal heat input with propane 2) kW 236-759 248-943 306-1057 371-1251
• Operating pressure heating min./max. (PMS) bar 1/6 1/6 1/6 1/6
• Operating temperature max. (Tmax) °C 95 95 95 95
• Boiler water content (V(H20)) l 831 756 718 1211
• Flow resistance boiler see diagram
• Minimum circulation water quantity l/h - - - -
• Boiler weight (without water capacity, incl. cladding) kg 1370 1540 1600 2130
•󰀩4) % 98.3/88.6 98.2/88.5 98.2/88.5 98.2/88.5
•󰀩4) %109.1/98.3 109.0/98.2 108.6/97.8 108.7/97.9
•󰀩
- without control  % ----
- with control  % ----
- with control and room sensor  % ----
- annual energy consumption QHE BY - - - -
• NOx class (EN 15502) 6 6 6 6
• Nitrogen oxide emissions (EN 15502) (GCV) NOx mg/kWh 36 36 41 37
• Carbon monoxide emissions at 50/30 °C (in relation to 3 % O2) CO mg/Nm323 25 26 23
• O2 % 6.0/5.8 6.0/5.9 6.0/5.9 6.0/5.9
• Heat loss in standby mode Watt 1200 1200 1200 1600
• Dimensions see dimensional drawing
•
- Natural gas E/LL mbar 17.4-300 17.4-300 17.4-300 17.4-300
- Propane mbar 37-57 37-57 37-57 37-57
• Gas inlet pressure max. (idle pressure) mbar 300 300 300 300
• Gas connection values at 15°C/1013 mbar:
- Natural gas E - (Wo = 15.0 kWh/m3) NCV = 9.7 kWh/m3m3/h 15.6-78.2 19.3-97.2 21.2-109.0 25.5-129.0
- Natural gas LL (G25) - (Wo = 12.4 kWh/m3) NCV = 8.13 kWh/m3m3/h 18.6-93.4 23.0-116.0 25.3-130.0 30.4-153.9
- Propane (G31) - NCV = 24.4 kWh/m32) m3/h 9.7-31.1 10.2-38.6 12.5-43.3 15.2-51.3
• Operating voltage V/Hz 1x230/50 1x230/50
3x400/50
1x230/50
3x400/50
1x230/50
3x400/50
• Electrical power consumption min./max. Watt 94/1012 203/1873 203/1933 271/4111
• Standby Watt 7 7 7 5
• Type of protection IP 20 20 20 20
• Permitted ambient temperature during operation °C 5-40 5-40 5-40 5-40
• Sound power level
- Heating noise (EN 15036 part 1) (room air dependent) dB(A) 78 83 82 86
- Flue gas noise radiated from the mouth
(DIN 45635 part 47) (room air dependent/independent of room air)
dB(A) - - - -
- Sound pressure level heating noise (standard value depending on installation
conditions)
dB(A) 68 73 72 76
• Condensate quantity (natural gas) at 50/30 °C l/h 57 68 72 100
• pH value of the condensate (approx.) ph 4.2 4.2 4.2 4.2
• Construction B23, B23P, C53, C63
• Flue gas system
- Temperature class T120 T120 T120 T120
-  kg/h 1198 1488 1669 1975
-  kg/h 238 295 325 390
- Flue gas temperature at max. nominal heat output and 80/60 °C °C 66 69 70 66
- Flue gas temperature at max. nominal heat output and 50/30 °C °C 44 47 49 45
- Flue gas temperature at min. nominal heat output and 50/30 °C °C 28 28 29 29
- Max. permissible temperature of the combustion air °C 48 48 48 48
-  Nm3/h 981 1219 1366 1617
-  Pa 130 130 130 130
-  Pa -50 -50 -50 -50
1) In relation to natural gas G20 (100 % methane). With a hydrogen content (H2) of up to 20 % in accordance with DVGW ZP3100 (D), an output
reduction of up to 7 % is possible.
2) Data related to NCV, conditional data
3) Data related to NCV. The boiler series is tested for EE/H setting. With a factory setting to a Wobbe value of 15.0 kWh/m3, operation in the Wob-
be value range from 12.0 to 15.7 kWh/m3is possible without resetting.
4) Conversion acc. to EN 15502-1, Appendix J

154 220 950 / 02
TECHNICAL INFORMATION
Type (1550) H (700) H (1100) H (1550)
• Nominal heat output at 80/60 °C, natural gas 1) kW 297-1447 132-653 203-1038 297-1447
• Nominal heat output at 50/30 °C, natural gas 1) kW 324-1550 146-703 229-1112 324-1550
• Nominal heat output at 80/60 °C, propane 2) kW 427-1439 174-643 299-1033 427-1439
• Nominal heat output at 50/30 °C, propane 2) kW 453-1550 187-703 316-1112 453-1550
• Nominal heat input with natural gas 3) kW 297-1469 134-668 206-1057 297-1469
• Nominal heat input with propane 2) kW 437-1469 180-668 306-1057 437-1469
• Operating pressure heating min./max. (PMS) bar 1/6 1/10 1/10 1/10
• Operating temperature max. (Tmax) °C 95 95 95 95
• Boiler water content (V(H20)) l 1118 509 709 1118
• Flow resistance boiler see diagram
• Minimum circulation water quantity l/h - - - -
• Boiler weight (without water capacity, incl. cladding) kg 2300 1144 1700 2440
•󰀩4) % 98.2/88.5 98.2/88.5 98.2/88.5 98.2/88.5
•󰀩4) %108.5/97.7 108.9/98.1 108.6/97.8 108.5/97.7
•󰀩
- without control  % ----
- with control  % ----
- with control and room sensor  % ----
- annual energy consumption QHE BY - - - -
• NOx class (EN 15502) 6 6 6 6
• Nitrogen oxide emissions (EN 15502) (GCV) NOx mg/kWh 35 40 41 35
• Carbon monoxide emissions at 50/30 °C (in relation to 3 % O2) CO mg/Nm323 26 26 23
• O2 % 6.0/6.0 6.0/5.7 6.0/5.9 6.0/6.0
• Heat loss in standby mode Watt 1600 1000 1200 1600
• Dimensions see dimensional drawing
•
- Natural gas E/LL mbar 17.4-300 17.4-80 17.4-300 17.4-300
- Propane mbar 37-57 37-57 37-57 37-57
• Gas inlet pressure max. (idle pressure) mbar 300 80 300 300
• Gas connection values at 15°C/1013 mbar:
- Natural gas E - (Wo = 15.0 kWh/m3) NCV = 9.7 kWh/m3m3/h 30.6-151.4 13.8-68.9 21.2-109.0 30.6-151.4
- Natural gas LL (G25) - (Wo = 12.4 kWh/m3) NCV = 8.13 kWh/m3m3/h 36.5-180.7 16.5-82.2 25.3-130.0 36.5-180.7
- Propane (G31) - NCV = 24.4 kWh/m32) m3/h 17.9-60.2 7.4-27.4 12.5-43.3 17.9-60.2
• Operating voltage V/Hz 1x230/50
3x400/50
1x230/50 1x230/50
3x400/50
1x230/50
3x400/50
• Electrical power consumption min./max. Watt 301/4141 67/1060 203/1933 301/4141
• Standby Watt 7 5 7 7
• Type of protection IP 20 20 20 20
• Permitted ambient temperature during operation °C 5-40 5-40 5-40 5-40
• Sound power level
- Heating noise (EN 15036 part 1) (room air dependent) dB(A) 85 76 82 85
- Flue gas noise radiated from the mouth
(DIN 45635 part 47) (room air dependent/independent of room air)
dB(A) - 71 - -
- Sound pressure level heating noise (standard value depending on installation
conditions)
dB(A) 75 66 72 75
• Condensate quantity (natural gas) at 50/30 °C l/h 138 48 72 138
• pH value of the condensate (approx.) ph 4.2 4.2 4.2 4.2
• Construction B23, B23P, C53, C63
• Flue gas system
- Temperature class T120 T120 T120 T120
-  kg/h 2230 1055 1669 2230
-  kg/h 450 211 325 450
- Flue gas temperature at max. nominal heat output and 80/60 °C °C 68 69 70 68
- Flue gas temperature at max. nominal heat output and 50/30 °C °C 46 49 49 46
- Flue gas temperature at min. nominal heat output and 50/30 °C °C 28 29 29 28
- Max. permissible temperature of the combustion air °C 48 48 48 48
-  Nm3/h 1830 863 1366 1830
-  Pa 130 130 130 130
-  Pa -50 -50 -50 -50
1) In relation to natural gas G20 (100 % methane). With a hydrogen content (H2) of up to 20 % in accordance with DVGW ZP3100 (D), an output
reduction of up to 7 % is possible.
2) Data related to NCV, conditional data
3) Data related to NCV. The boiler series is tested for EE/H setting. With a factory setting to a Wobbe value of 15.0 kWh/m3, operation in the Wob-
be value range from 12.0 to 15.7 kWh/m3is possible without resetting.
4) Conversion acc. to EN 15502-1, Appendix J

16 4 220 950 / 02
TECHNICAL INFORMATION
2.2.3 Heating water side flow resistance
UltraGas® 2 (125,150)
Flow rate (m3/h)
Pressure drop (mbar)
UltraGas® 2 (190,230)
Flow rate (m3/h)
Pressure drop (mbar)
UltraGas® 2 (300-500)
Flow rate (m3/h)
Pressure drop (mbar)
UltraGas® 2 (530-700)
Flow rate (m3/h)
Pressure drop (mbar)
UltraGas® 2 (800-1100)
Flow rate (m3/h)
Pressure drop (mbar)
UltraGas® 2 (1300,1550)
Flow rate (m3/h)
Pressure drop (mbar)

174 220 950 / 02
TECHNICAL INFORMATION
2.3 Dimensions
2.3.1 UltraGas®2 (125-1550) dimensions
(Dimensions in mm)
Type A B C D D1 D2 D3 E F G H J K l M N O Q R
(125,150) 1923 720 1182 799 754 242 - 533 1681 1479 714 122 334 134 207 207 65 192 1725
(190,230) 1968 820 1256 895 854 242 - 633 1726 1517 717 145 337 134 204 204 69 226 1778
(300-500) 1923 930 1632 1165 1204 242 - 743 1683 1447 745 169 365 131 285 285 189 13 1735
(530-700) 2234 1110 1722 1184 1294 242 - 923 1982 1564 757 203 377 128 286 286 225 -2 1966
(800-1100) 2255 1290 1822 1364 1480 242 - 1103 1987 1573 788 215 408 128 378 378 225 58 1959
(1300,1550) 2395 1560 2200 1640 1790 250 895 1363 2103 1600 822 238 442 138 420 420 218 22 2064
H (700) 2234 1110 1722 1184 1294 242 -923 1982 1564 757 203 377 128 286 286 225 -2 1966
H (1100) 2255 1290 1822 1364 1480 242 -1103 1987 1573 788 215 408 128 378 378 225 58 1959
H (1550) 2395 1560 2200 1640 1790 250 895 1363 2103 1600 822 238 442 138 390 390 218 22 2064
Type S T U V W X X1 Y Z 1,2,5 * 3 4 8 10 11
(125,150) 318 40 1725 101 124 319 99 157 139 DN 65 / PN 6 / 4-hole   Ø 155/159 DN 40 Ø 122/125
(190,230) 371 50 1778 101 124 319 99 195 139 DN 65 / PN 6 / 4-hole   Ø 155/159 DN 40 Ø 197/200
(300-500) 368 40 1736 101 121 316 96 217 184 DN 100 / PN 6 / 4-hole   Ø 252/256 DN 40 Ø 197/200
(530-700) 483 75 1938 176 118 328 89 267 211 DN 100 / PN 6 / 4-hole   Ø 302/306 DN 40 Ø 247/250
(800-1100) 572 100 1959 176 118 374 89 357 219 DN 125 / PN 6 / 8-hole   Ø 302/306 DN 40 Ø 247/250
(1300,1550) 621 100 2064 190 128 398 89 455 244 DN 150 / PN 6 / 8-hole   Ø 402/406 DN 40 Ø 247/250
H (700) 483 75 1938 176 118 328 89 267 211 DN 100 / PN 16 / 8-hole   Ø 302/306 DN 40 Ø 247/250
H (1100) 572 100 1959 176 118 374 89 357 219 DN 125 / PN 16 / 8-hole   Ø 302/306 DN 40 Ø 247/250
H (1550) 621 100 2064 190 128 398 89 455 244 DN 150 / PN 16 / 8-hole   Ø 402/406 DN 40 Ø 247/250
* DN = nominal diameter, PN = nominal pressure
1 Flow
2 Low-temperature return
3 Gas connection
4 
5 High-temperature return
6 Electrical connection on the left or right
7 Filling/drain valve (behind the front door)
8 Flue gas outlet left or right
9 Control panel
10 Condensate drain with siphon and screw connection
for plastic pipe
11 Combustion air suction socket (option)
12 Boiler feet adjustable 30-80 mm
13 
14 
15 
16 
17 
18 Cleaning opening left or right
19 
system flow sensor
Notice
For required space, see chapter 2.3.3.

18 4 220 950 / 02
TECHNICAL INFORMATION
UltraGas®2 Dimensions for multi-part installation
type A B C D E F G H I J K
(125,150) 1765 580 957 880 1519 1625 1421 946 140 580 242
(190,230) 1818 680 1054 980 1583 1678 1484 1037 140 680 236
(300-500) 1777 790 1400 1330 1544 1637 1451 1391 140 950 316
(530-700) 2099 970 1516 1420 1708 1940 1605 1437 159 970 316
(800-1100) 2120 1150 1712 1606 1729 1945 1625 1722 175 1150 408
(1300,1550) 2255 1410 2032 1916 1779 2056 1671 2042 199 1410 458
UltraGas®2 Base Heat exchanger Burner
type kg kg kg
(125) 34 207 29
(150) 34 220 29
(190) 42 272 39
(230) 42 293 39
(300) 60 440 54
(350) 60 474 54
(400) 60 509 50
(450) 60 543 50
(500) 60 565 50
(530) 79 868 78
(620) 79 929 80
(700) 79 977 80
[phone] 93
(1000) 104 1154 100
(1100) 104 1347 100
(1300) 155 1683 160
(1550) 155 1847 160
B
K = xD
T
B
T = xD
K
Example calculation for the required corridor width
Door width T = 800
UltraGas®2 (500) K = 790 x1330 = Corridor width 1314
800
B = Boiler width
D = Maximum boiler length
T = Door width
K = Corridor width
Required minimum width of door and corridor for boiler installation
The following values are the calculated minimum values (dimensions in mm)
Weights for multi-part installation UltraGas® 2
2.3.2 Overall unit dimensions
Boiler without cladding and insulation
(Dimensions in mm)
!
WARNING
• The boiler must only be suspended using
the four points marked as the crane sus-
pension option in Fig. 02. The hooks on
the rear of the boiler must not be used to
suspend it.
• The four chains must be at least 1.5 m long.
Burner (only dismantle if
necessary)
Base
Heat exchanger
K
T
< 150
B
C
D

194 220 950 / 02
TECHNICAL INFORMATION
UltraGas®2
type A 1) A minimum 2) B C H 3) H minimum 4) Q
(125,150) 169 106 720 1060 1953 1934 125
(190,230) 155 71 820 1160 1998 1979 2
(300-500) 513 156 930 1510 1953 1937 60
(530-700) 121 121 1110 1600 2264 2255 155
(800-1100) 280 195 1290 1786 2285 2276 119
(1300,1550) 291 154 1560 2104 2425 2416 163
H (700) 121 121 1110 1600 2264 2255 155
H (1100) 280 195 1290 1786 2285 2276 119
H (1550) 291 154 1560 2104 2425 2416 163
1) If the room height is too low: the dimension can be reduced (see A minimum).
2)
Caution! At A minimum, the burner can no longer be swivelled out completely. Cleaning with UltraGas
®
2 (125-230) and UltraGas
®
2 (530-1550)
still possible.
3) Height value assumes adjustable feet are set to 30 mm.
4)
*
The heat generator can be placed with one side directly on the wall. However, to protect heat-sensitive
walls against damage, a distance of at least 150 mm from the wall must be provided.
*
The cleaning opening must be easily accessible. As a result, a minimum distance of 500 mm must be
maintained on the cleaning opening side.
2.3.3 Space requirement
(Dimensions in mm)
For swinging out the burner, this area
must remain free
Route gas connection
straight to the rear
A minimum

20 4 220 950 / 02
TECHNICAL INFORMATION
2.3.3.1 Installation variants with reduced height requirements
(Dimensions in mm)
UltraGas® 2 with masonry base and adjustable feet

H minimum
UltraGas® 2 with masonry base without adjusting feet

H minimum
1 Neutralisation unit (option)
2 Condensate pump (optional)
3 Masonry base
4 Adjustable feet 30-80 mm
5 Siphon 2)
1) Height value assumes adjustable feet are set to 30 mm
2) Caution!
UltraGas®2
type H minimum 1)
(125,150) 1934
(190,230) 1979
(300-500) 1937
(530-700) 2255
(800-1100) 2276
(1300,1550) 2416
H (700) 2255
H (1100) 2276
H (1550) 2416
UltraGas®2
type H minimum 1)
(125,150) 1934
(190,230) 1979
(300-500) 1937
(530-700) 2255
(800-1100) 2276
(1300,1550) 2416
H (700) 2255
H (1100) 2276
H (1550) 2416
Notice
• The steps of the climbing aid provided
must be horizontal. Adapt the climbing aid
if necessary.
• No refunds for base plates and adjustable
feet.
• With H minimum, cleaning the siphon is
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