Viessmann Vitodens 100-W B1HA Instruction manual

Technical Data Manual
VITODENS

100-W
5784 566 - 10 03/2019
Vitodens 100-W
B1HA Series and B1KA Combi Boiler
Wall-Mounted, gas-fired condensing boilers
On demand domestic hot water with Combi boiler
Heating input: 21 to 125 MBH
6.2 to 36.6 kW
Model Nos. and pricing: see Price List
Gas-Fired Wall-Mounted Condensing Boiler with modulating
stainless steel MatriX cylinder burner, stainless steel Inox-
Radial heat exchanger for room air independent operation
(using a direct vent system) or room air dependent operation.
B1KA comes equipped with an on demand hot water unit
providing reliable hot water without a DHW tank.
H

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Product Information
General
Equipped with a Viessmann stainless steel heat exchanger
for lasting performance and reliability and a modulating
MatriX cylinder gas burner, the Vitodens 100-W wall-
mounted condensing boiler is the perfect combination of
value, quality and Viessmann technology.
The benefits at a glance:
Outstanding efficiency
of 95.0% A.F.U.E. on all models.
Lasting performance
with Viessmann-made SA240 / S43932 stainless steel
Inox-Radial heat exchanger constructed to ASME
Section IV and CSA B51.
Low-emission
with fully-modulating stainless steel MatriX cylinder
burner. Factory calibration eliminates adjustments in
the field.
< 45 ppm NOx (at 3% O2)
Control variety
Integrated boiler control interfaces with any level of
external control - from room thermostat to outdoor
reset and more.
Compact, lightweight wall mount design
and zero clearance to combustibles make it a great
choice for limited-space installations.
Extremely quiet operation
quieter than most refrigerators.
< 52 dBA [at 3.3 ft. (1 meter)]
Easy installation, service and maintenance
with all pipe connections located at the bottom
and serviceable components (including electrical
connections) easily accessible from the front.
Multiple venting options
- Horizontal or vertical sealed combustion
coaxial, PP(s) vent system (Viessmann supplied).
- Horizontal, vertical or hybrid sealed combustion
double-pipe CPVC vent system (field supplied).
- Horizontal or vertical single pipe CPVC vent system
(field supplied).
- Horizontal or vertical single or double pipe PP(s),
flexible vent system (Viessmann supplied).
Suitable for high altitude levels
of up to 10,000 ft. (3,000 m).
Built-in automatic frost protection
allows boiler to be shut off for an extended period
of time while protecting it against freeze-up.
Reliable on demand domestic hot water (B1KA)
- Plate type heat exchanger
- Built-in diverting valve
- Built-in Grundfos 3-speed pump
- Built-in pressure bypass valve
- Built-in water hammer arrester
- Built-in flow sensor
- Built-in temperature sensor
- Supplied with a pressure relief valve rated at 150 psi
Limited lifetime warranty
in residential applications.
The B1KA boiler conforms to NSF/ANSI 372 for “lead
free” plumbing products as defined by applicable
US state laws and by section 1417 of the US Safe
Drinking Water Act.

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data General
Product Information
Boiler cross-section
Legend
AInox-Radial stainless steel heat exchanger
BStainless steel MatriX cylinder burner
CBurner blower
DGas and hydronic connections
EBoiler control
Standard Equipment:
Wall-mount boiler and installation fittings c/w 30 psi
pressure relief valve, pressure gage, gas shut-off valve,
two fill/drain valves, all mounting hardware, outdoor
temperature sensor, and LP conversion kit.

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Specifications
Technical Data
Standard heating boiler
Boiler Model No. B1HA 26, 94 B1HA 35, 125 B1KA 35, 125
CSA input Natural gas (NG)
CSA input Liquid propane Gas (LPG)
CSA output/DOE 1
heating capacity NG
CSA output/DOE 1
heating capacity LPG
Net AHRI rating 2
MBH
kW
MBH
kW
MBH
kW
MBH
kW
MBH
21-94
6.2-27.5
31-94
9.1-27.5
20-87
5.7-25.6
29-87
8.4-25.6
76
21-125
6.2-36.6
31-125
9.1-36.6
20-116
5.7-34.1
29-116
8.4-34.1
101
21-125
6.2-36.6
31-125
9.1-36.6
20-116
5.7-34.1
29-116
8.4-34.1
101
Heat exchanger surface area ft.2
m2
12.96
1.2
12.96
1.2
12.96
1.2
Min. gas supply pressure
Natural gas
LPG
“w.c.
“w.c.
4
10
4
10
4
10
Max. gas supply pressure 3
Natural gas and LPG “w.c. 14 14 14
A.F.U.E. % 95.0 95.0 95.0
Weight lbs
kg
79.4
36
79.4
36
90.0
41
Shipping weight lbs
kg
88.2
40
88.2
40
99.2
45
Boiler water content
USG
L
1.02
3.88
1.02
3.88
1.02
3.88
Boiler max. flow rate 4
GPM
L/h
6.2
1400
6.2
1400
6.2
1400
Max. operating pressure
(max. allowable working pressure)
at 210ºF (99ºC)
psig
bar
45
3
45
3
45
3
Boiler water temperature
- Adjustable high limit (AHL) range
- space heating (steady state)
- Fixed high limit (FHL)
ºF (ºC)
ºF (ºC)
86 to 176 (30 to 80)
210 (99)
Boiler connections
Boiler heating supply and return
Pressure relief valve
DHW tank heating supply/return
DHW heating
Drain valve
NPTM (male)
NPTF (female)
NPTM (male)
NPTM (male)
(male thread)
cin.
cin.
cin.
--
cin.
cin.
cin.
cin.
--
cin.
cin.
cin.
--
bin.
cin.
Dimensions
Overall depth
Overall width
Overall height
inches
(mm)
inches
(mm)
inches
(mm)
15c
(400)
15c
(400)
30a
(768)
15c
(400)
15c
(400)
30a
(768)
15c
(400)
15c
(400)
30a
(768)
1Output based on 140ºF (60ºC), 120ºF (49ºC) system supply / return temperature.
2Net AHRI rating based on piping and pick-up allowance of 1.15.
3If the gas supply pressure exceeds the maximum gas supply pressure value,
a separate gas pressure regulator must be installed upstream of the heating system.
4See “System Flow Rates” on pages 25 and 26 in this manual.

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Specifications (continued)
Technical Data
Boiler Model No. B1HA 26, 94 B1HA 35, 125 B1KA 35, 125
Gas supply connection NPTM (male) cin. cin. cin.
Flue gas 5
Temperature at boiler
return temperature of
86ºF (30ºC)
- at rated full load
- at rated partial load
Temperature at boiler
return temperature of 140ºF (60ºC)
ºF (ºC)
ºF (ºC)
ºF (ºC)
113 (45)
95 (35)
167 (75)
113 (45)
95 (35)
172 (78)
113 (45)
95 (35)
172 (78)
Flue gas value
Mass flow rate (of flue gas)
- at rated full load
- at rated partial load
Available draught
lbs/h
kg/h
lbs/h
kg/h
Pa
mbar
79.2
36.0
33.0
15.0
100
1.0
100.1
45.5
33.0
15.0
100
1.0
100.1
45.5
33.0
15.0
100
1.0
Flue gas temperature
sensor limit ºF (ºC) 230 (110) 230 (110) 230 (110)
Average condensate
flow rate 6
with natural gas
- TS/TR=122 / 86ºF (50 / 30ºC) USG/day
L/day
1.95-2.3
8-9
2.5-2.8
9.4-10.5
2.5-2.8
9.4-10.5
Condensate
connection 7
hose
nozzle
Ø in 1 1 1
Boiler flue gas
connection 8
Ø
in (mm) 2e(60) 2e(60) 2e(60)
Combustion air supply coaxial
connection 8 single
outer Ø in (mm) 4 (100)
2e(60)
4 (100)
2e(60)
4 (100)
2e(60)
Noise level (at 1 meter)
- at full load
- at partial load
(dB)
(dB)
46.9
41.1
51.6
41.1
51.6
41.1
High altitude (factory set) 9ft. (m) 0-5,000 (0-1,500)
Standard heating boiler (continued)
5Measured flue gas temperature with a combustion air temperature of 68°F (20°C).
6Based on typical boiler cycles, including partial load conditions.
7Requires 1 in. (25 mm) tubing. See Vitodens 100-W Installation Instructions for details.
8For detailed information refer to the Vitodens Venting System Installation Instructions.
9For 5,000 to 10,000 ft. (1,500 to 3,000 m) operation, a control programming change is required.
Refer to the Installation and Service Instructions for details.
Note: For altitude operation up to 4,999 feet, derate the input capacity by 3%/1000 ft. (305 m).
For operation from 5,000 to 10,000 ft. (1,500 to 3,000 m), with the electronic altitude adjustment made,
derate the input capacity by 3% for every 1000 ft. (305 m) starting at 5000 ft. (1,500 m) for a total of 15%.
Legend
AInput capacity after electronic altitude adjustment is made.

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Specifications (continued)
Technical Data
Boiler Model No. B1KA 35, 125
Max. Input NG and LPG
(DHW production only)
MBH
kW
149
43.7
Max. boiler temperature (during DHW production) ºF (ºC) 176 (80)
DHW supply temperature ºF (ºC) 140 (60)
Continuous draw rate *1
at t= 77ºF (43K) USG/min.
(L/h)
3.5
(795)
Max. flow through heat exchanger USG/min.
(L/h)
3.7
(840)
Maximum allowable working pressure (potable water) psi 150
Test pressure psi 300
Integrated pump flow rate
DHW production @ 23 ft. (9.8 m)
Head pressure
Heating system operation
with system side additional
drop in pressure of max. 6 ft. of water (1.8 m)
USG/min.
(L/h)
USG/min.
(L/h)
5.63
(1278)
6.2
(1408)
Expansion tank *2
(for heating system side)
Precharge pressure
Capacity
psig
USG
(L)
12
2.1
(8)
*1DCW and DHW temperature rise would be proportional. Maximum DHW supply temperature is 140ºF (60ºC).
*2 Determine the required size of the expansion tank to be installed in the heating system.
If the integral expansion tank is insufficient, install a suitably sized expansion tank on site.
B1KA on demand hot water operation

7
5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data Dimensions
Boiler Dimensions Without Bottom Piping Connections
Vitodens 100-W, B1HA series and B1KA combi
Legend
ACondensate drain, plastic hose Ø 1 in. (Ø 22 mm)
BBoiler water supply, NPT ¾ in. (male thread)
CGas connection, NPT ¾ in. (male thread)
DBoiler water return, NPT ¾ in. (male thread)
ECombustion air opening for double pipe system
FCombustion air opening for coaxial system
G- For B1HA series, DHW tank heating supply
- For B1KA combi, DHW
H- For B1HA series, DHW tank heating return
- For B1KA combi, DCW
IOpening for pressure relief valve
Dimensions
a ain. (6 mm) - both sides of the boiler
b 15¾ in. (400 mm)
c 2fin. (68 mm)
d 27½ in. (700 mm)
e 47/8in. (123 mm)
f 6 in. (150 mm)
g 15¾ in. (400 mm)
h 5 in. (125 mm)
i 9ein. (250 mm) minimum
j 1din. (34 mm)
k 77/8in. (200 mm)
l 3din. (80 mm)
m 2ain. (58 mm)
Front view Side view Top view

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Dimensions
Boiler Dimensions With Piping Connections
Piping connections for Vitodens 100-W,
B1HA series and B1KA
Legend
A- DHW tank heating supply for B1HA boilers
- DHW for B1KA boiler
B- DHW tank heating return for B1HA boilers
- DCW for B1KA boiler
BWR Boiler water return
BWS Boiler water supply
BD Boiler drain
BF Boiler fill
GC Gas connection
PRV Pressure relief valve
PG Pressure gauge
VC Venting connection
TG Temperature gauge
* Field supplied

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Boiler Minimum Clearances
Dimensions
Note:The Vitodens 100-W boiler has passed the zero
inches vent clearance to combustibles testing
requirements dictated by the boiler Harmonized
Standard ANSI Z21.13. CSA 4.9 (latest edition)
and therefore is listed for zero clearance to
combustibles when vented with a single-wall
special venting system (AL-29-4C material) or
UL/ULC-listed CPVC gas vent material.
The zero inches vent clearance to combustibles for
the Vitodens 100-W boiler supercedes the clearance
to combustibles listing that appears on the special
venting system label.
Top clearance - 12” (30 cm).
See the Vitodens Venting System
Installation Instructions.
Clearance to combustibles
AL = Alcove
CL = Closet
Top Front Rear Left Right Vent
pipe*1
0 0 AL,
CL
00 0 0
Front
Side
Side
Back
Top
*1 Refer to the Installation Instructions of the Vitodens
Venting System for details.
Recommended minimum boiler clearances to combustibles
Recommended minimum boiler service clearances

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Heating Circuit Pumps
Waterside Flow (boiler circuit)
The Vitodens 100-W is designed only for closed loop,
forced circulation hot water heating systems.
Pressure drop (primary circuit) of Vitodens 100-W
Heating circuit pumps
The Vitodens 100-W B1HA/B1KA comes with a built-in
boiler pump.
All other pumps are field supplied and should be sized
based on pressure drop.
Pump selection must be based on accurate system flow
and pressure drop calculations (including DHW sizing).
A low-loss header must be used when the system flow
rate exceeds the maximum (or minimum) flow rate of
the Vitodens 100-W boiler. An alternative method may
be used, such as primary secondary piping using closely
spaced tees.
A low-loss header offers additional benefits not provided
by a pair of closely spaced tees. Viessmann strongly
recommends and prefers the use of a low-loss header over
closely spaced tees. Please see page 17 for details.
Use standard friction loss method for pipe sizing.
Observe boiler maximum and minimum flow rate limitations.
If system flow rate exceeds boiler maximum flow rate
(as stated on page 17) or if system flow rate is unknown,
Viessmann strongly recommends the installation of
a low-loss header. See page 17 for low-loss header
information or refer to the Vitodens Venting System
Installation Instructions.
IMPORTANT
Operation
Flow rate
Supply head pressure (water)

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data Operation
Heating Circuit Pumps (continued)
Pump Model Grundfos UPS15-78
Rated voltage VAC 115
Rated current A max. 1.15
A min. 0.8
Capacitor F8
Power consumption W max. 130
W min. 80
Built-in pump - Residual head
Grundfos UPS15-78 three speed heating circuit/DHW production pump for Vitodens 100-W B1HA 26, 35, 94, 125 and
B1KA 35, 125 boilers (in the factory setting, the pump speed is preset to ‘speed three’)
Built-in pump, Grundfos UPS15-78 residual head pressure
Residual head of built-in pump at speed 3 (factory set).
Flow
Supply Head Pressure
Flow
Speed One
Speed Three
Speed Two
Supply Head Pressure

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Heating Circuit Pumps (continued)
DHW Production Planning
With the B1KA for instantaneous DHW heating or the
B1HA DHW connections for DHW production via a
stand-alone DHW storage tank, the Vitodens 100-W
boilers series offers the right solution for every need.
Various factors must be taken into account when
designing the DHW system and when deciding between
the instantaneous DHW production with the B1KA and
DHW production via a stand-alone DHW storage tank with
the B1HA.
Options
B1HA B1KA
DHW requirement,
level of comfort and
convenience
DHW requirement for an apartment + +
DHW requirement for a single-family house + 0
Central DHW requirement for a multi-family house + -
Decentralized DHW requirement for a multi-family house + +
Number of draw points One draw point 0 +
Several draw points, non-simultaneous use 0 +
Several draw points, simultaneous use + -
Distance of draw
points from the boiler/
DHW storage tank
Up to 23 ft. (7 m) (without DHW recirculation line) - +
With DHW recirculation line + -
System retrofit DHW storage tank already installed + -
Replacement of existing Combi boiler - +
Space requirements Minimal space available (installation in alcove) 0 +
Adequate space available (boiler room) + +
+ (recommended)
0 (recommended in certain cases)
- (not recommended)
Such factors are:
DHW requirement, level of comfort and convenience
Number of draw points
Distance of draw points from the boiler/DHW storage tank
System retrofit
Space requirements
Operation

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data Operation
Heating Circuit Pumps (continued)
Domestic Hot Water Production via Instantaneous DHW Plate Heat Exchanger (B1KA)
The B1KA is equipped with an electronically controlled instantaneous DHW plate heat exchanger.
The comfort control function (if selected) ensures that the instantaneous DHW plate heat exchanger is kept warm.
This translates into immediate availability of domestic hot water at any required temperature level.
Technical Data DHW Plate Heat Exchanger
See pages 4,5 and 6 in this manual for technical data.
B1KA heat exchanger performance
DHW supply temperature for B1KA 35, 125 (with mixed water)
This chart illustrates the changes in the outlet temperature,
subject to the flow rate at the tap.
If greater volume (max. flow rate through heat exchanger=
3.7 GPM) of water is required, cold water needs to be
mixed which reduces the outlet temperature.
Curve is only applicable for a DCW inlet temperature of
50ºF and a boiler input of 149,000 MBH (Vitodens 100-W,
B1KA 35, 125).
Max. recovery rate @ DHW temperature of 140ºF = 3.0 GPM
Min. flow through the heat exchanger for boiler start= 0.4 GPM
DHW supply temperature
DHW flow rate
A diaphragm expansion tank is integrated into the
Vitodens 100 B1KA, with a capacity of 2.1 USG (8 L)
and a pre-charge pressure of 12 psig.
Determine the required size of the expansion tank to be
installed in the heating system. If the integral expansion
tank is insufficient, install a suitably sized expansion tank
on site.
IMPORTANT
B1KA - 35 DHW Pressure Drop
Pressure Drop
DHW Flow

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Start-up and Maintenance
Start-up and Maintenance
Mounting
Domestic Hot Water Production via DHW Storage Tank
Vitodens 100-W B1HA series boilers can be used in
conjunction with the stand-alone DHW storage tanks
offered by Viessmann.
Size and select the DHW storage tank based on the
forecast DHW consumption of the building in question.
For further technical information on DHW storage tanks,
see the Vitocell Technical Data Manual.
Mounting Vitodens 100-W boiler
Installation
Boiler mounting bracket and frame
1. Attach the wall mounting bracket (supplied with the
boiler) to the boiler mounting frame using the supplied
hardware. Ensure that the wall mounting bracket is
level.
2. Move the rack into position and secure to the floor
(and to the wall if needed).
CAUTION
The boiler must be level both vertically and horizontally
to ensure proper draining of the condensate.
Refer to the single boiler rack Installation
Instructions for more details.
Legend
ABoiler mounting

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data Installation
Condensate Connection
Install the condensate drain pipe Ø 7/8 in. (Ø 22 mm) with
a suitable gradient (min. 2.5%).
Discharge condensate from the boiler into the drainage
system, either directly or (if required) via a neutralization
unit (accessory).
Condensate connection for Vitodens 100-W
model B1HA 26, 35, 94, 125 and B1KA 35, 125
Pipe ventilation must take place between the siphon trap
and the neutralization unit (if applicable).
IMPORTANT
Condensate Drainage and Condensate Neutralization
The condensate formed both in the condensing boiler and
in the flue gas pipe must be discharged into the public
sewage system in accordance with all applicable local
regulations. The condensate produced by a gas-fired
heating system has a pH value between 3 and 4.
Some local codes may require the use of a separate
neutralization unit to treat the aggressive and corrosive
condensate.
With a neutralization unit installed, all condensate from the
boiler and the flue gas pipe enters into the neutralization
unit where it is treated and released into the public sewage
system with a safe pH value of above 6.5.
The use of neutralization granulate (performing the
neutralizing process) is dependent on the operation of the
heating system. To determine the required refill amount,
check granulate level several times during the first year
of operation. In some cases one granulate fill may last
an entire year.
Contact Viessmann to order a neutralization unit for the
Vitodens 100-W boiler.
See Viessmann Price List for order information.
The condensate discharge outlet to the drainage system
connection must be clearly visible. It must be installed with
a suitable gradient and provided with a stench trap.
If the condensate outlet of the Vitodens 100-W boiler is
lower than the drain, a condensate pump must be used.
Only corrosion-resistant materials may be used for
condensate drainage purposes (e.g. braided hose).
Do not use galvanized materials or materials containing
copper for piping, couplings etc. The condensate drain
must have a trap.
Please note that other requirements may apply depending
on local regulations and/or project-specific details.
It is advisable to contact your local waterworks office
(authority responsible for waste water regulations)
well before commencing with the installation of the
neutralization unit in order to establish details of local
regulations that apply.
The following table shows the concentration of (effluent)
substances (e.g. heavy metals) contained in the waste
water from the Vitodens 100-W condensing boiler.
The condensate drain of the Vitodens 100-W boiler is
equipped with a built-in siphon trap in order to keep flue
gases from being discharged via the condensate drain.
Condensate
(effluent) substances
Values measured
in mg/L Vitodens 100
Lead
Cadmium
Chromium
Copper
Nickel
Zinc
Tin
< 0.01
< 0.005
< 0.01
< 0.01
< 0.01
< 0.05
< 0.05
Condensate
Legend
AFlexible discharge tubing
BDischarge tubing

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5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Start-up and Maintenance
Start-up and Maintenance
Vitodens 100-W Venting Options
For detailed information refer to the Vitodens Venting
System Installation Instructions.
Electrical Connection
All electrical connections are made to the boiler’s
integrated boiler control unit (120VAC, 1 phase, 60 Hz,
12 amps).
Use disconnect means and power service switch
as per local code requirements.
Control Unit
Function and construction:
The control is integrated into the Vitodens 100-W boiler.
Integrated diagnostic system
For room temperature-dependent operation,
an external control or a room temperature thermostat
may be connected
To control DHW temperature
External heat demand
OpenTherm (OT) or OT input module 0-10VDC (accessory)
Viessmann outdoor temperature sensor (OTS)
(field wiring)
OpenTherm (OT) (field wiring)
Instantaneous DHW control (B1KA)
The control unit consists of:
LCD Display
Push button operation and setting of boiler water
temperature
Temperature adjustable high limit
Boiler temperature sensor
Burner fault display
Burner fault reset
Pressure gauge
Fuse
Boiler temperature sensor
The boiler temperature sensor is connected to the control
unit and built into the boiler.
Frost protection
Frost protection is continuously active. The burner is
switched ON when the boiler water temperature reaches
41°F (5°C) and is switched OFF again when the boiler
water temperature reaches at least 59°F (15°C)
[but not more than 68°F (20°C)].
Venting Options / Electrical Connections
Installation
For details on the control, refer to the
Vitodens 100-W Operating Instructions.

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5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data Installation
IMPORTANT
Accessories for the Vitodens 100-W
Neutralization Unit for Single-Boiler Applications
with neutralizing granulate for Vitodens 100-W, B1HA 26, 35,
94, 125 and B1KA 35, 125
Part No. 7134 231
Low-Loss Header
- Type 80/60
[max. flow rate 19.5 GPM (4.4 m3/h)]
- Type 120/80
[max. flow rate 35.2 GPM (8 m3/h)]
A low-loss header offers additional benefits not provided
by a pair of closely spaced tees. Viessmann strongly
recommends and prefers the use of a low-loss header
over closely spaced tees. When used in conjunction with
the Vitodens 100-W boiler, the low-loss header acts as
hydraulic break, decoupling boiler and system circuits from
each other (no sensor required). It is recommended to
use the low-loss header in applications in which the total
system flow rate exceeds the maximum or falls below the
minimum flow rate of the Vitodens 100-W boiler.
Product may not look exactly as illustrated.
The low-loss header is available in the following sizes.
Select the size based on the maximum system flow rate
of your application.
Legend
Vprimary Boiler circuit flow rate
Vsecondary Heating circuit flow rate
Vbypass Bypass flow rate
Qprimary Heat supplied by boiler
Qsecondary Heat consumed by system
Vprimary < Vsecondary
T1 > T3
T2 = T4
Qprimary = Qsecondary
T1 176°F (80°C)
Vsecondary=Vprimary+Vbypass
When installing a low-loss header, system mixed supply
temperature (T3) must be calculated as follows
For maximum boiler flow rates, see the table on pages 10
and 11 in this manual.
Viessmann strongly recommends the use of a low-loss
header in cases where the system head and flow rates
are unknown.
In addition, the low-loss header helps eliminate air and
debris [D] from the heating system. See illustrations for
Low-loss header design and the principle of operation.
Product may not look exactly as illustrated.
Low-loss header design
Vprimary Vbypass Vsecondary
AB Air Bleed DV Drain Valve
BR Boiler Return SR System Return
BS Boiler Supply SS System Supply
BY Bypass
(with laminar flow)
TS Viessmann Temp.
Sensor (not used)
D Debris and/or air SW Sensor Well
T1 Boiler supply temp. T3 System supply temp.
T2 Boiler return temp. T4 System return temp.
Model No. Max. system flow rate
Type 80/60 19.5 GPM (4.4 m3/h)
Type 120/80 35.2 GPM (8 m3/h)
Accessories
T1
T4
T3
T2
Principal of operation

18
5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Installation
Accessories
DHW Tank Temperature Sensor
(immersion temperature sensor)
Supplied with:
- Cable length approx. 13 ft. (3.75 m), ready to plug in
- All pipe connections are field supplied.
Specification
Max. ambient temp.
- at operation: 32 to 194ºF (0 to 90ºC)
- when storing
or transporting: - 4 to+158ºF (-20 to+70ºC)
- Sensor type: Viessmann NTC
10K ohms @ 77ºF (25ºC)
Outdoor Temperature Sensor (OTS)
Sensor location:
- North or northwest wall of building
- 80 to 100 in. (2 to 2.5 m) above ground or in case
of a multi-storey building approximately halfway up
the second floor
Electrical connection:
- 2-wire cable, max. cable length 115 ft. (35 m)
with a wire size of min. AWG 16 copper
- Cable to the outdoor sensor must not be laid near
line voltage wiring (120/240V)
Max. ambient temperature
during transport, storage
and operation: -40 to 194ºF (-40 to 90ºC)
Temperature
Resistance in k ohms
Viessmann NTC 10 kΩ
Temperature
Resistance in k ohms

19
5784 566 - 10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Standard Equipment
The Vitodens 100-W gas-fired condensing boiler with
Inox-Radial heat exchanger surfaces, modulating stainless
steel MatriX cylinder gas burner c/w:
installation fittings with 30 psig pressure relief valve,
air vent and pressure gauge
two fill/drain valves
all mounting hardware
Outdoor temperature sensor (OTS)
temperature gauge
DHW pressure relief valve (B1KA)
DHW sensor (B1HA)
The boiler comes fully piped and pre-wired.
Wall mounting componentry
The following wall mounting components are supplied with
the Vitodens 100-W boiler:
Mounting bracket
Mounting bolts
Installation fittings
Screws for mounting bracket on
- wood studs (2 in. x 4 in.)
- metal studs
- brick/concrete wall
How the Vitodens 100-W boiler operates...
The Vitodens 100-W boiler uses a premix combustion
system, which is designed to deliver a certain air-gas
mixture to the burner for complete combustion. The gas
is injected upstream of the blower. The burner and heat
exchanger are part of a forced-draft design. The benefits
of forced-draft systems are lower component
temperatures, direct air-fuel connection (premix) for
improved mixing, and longer service life of the boiler due
to mild to moderate ambient conditions.
The MatriX cylinder burner, blower and the combination
gas valve are factory calibrated and pre-adjusted.
A pneumatic link between combustion air and gas flows
guarantees optimal boiler performance at all firing rates.
Blower speed is automatically increased or decreased
based on heat demand, thereby regulating the amount
of combustion air drawn. The pneumatic link between air
and gas introduces the required amount of gas for optimal
combustion to meet the current heat demand, based on
a linear relationship between P air and P gas.
Installation Examples
The examples on the following pages depict possible
piping layouts of the Vitodens 100-W boiler.
Please note that the following examples are simplified
conceptual drawings only!
Piping and necessary componentry must be field
verified. A low water cut-off (LWCO) must be installed
where required by local codes. Proper installation and
functionality in the field is the responsibility of the heating
contractor.
IMPORTANT
Standard Equipment
Installation

20
5784 566 -10
Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Vitodens 100-W, B1HA 26, 35, 94, 125 with one heating circuit
Legend
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief valve
AVitodens 100-W
BRoom thermostat
CHeating circuit
DExpansion tank
EDHW storage tank
FDHW tank temperature sensor
GOutdoor temperature sensor (OTS)
Note: The use of a low-loss header is recommended if the
water flow rate is less than 1.7 GPM (400 L/h) or
more than 6.2 GPM (1400 L/h).
The low-loss header is available as accessory part.
Maximum Flow Rates
Ensure that a pressure activated by-pass is installed if
there are system component(s) in Cthat may isolate the
flow to the pump.
IMPORTANT
System Layout 1
Model B1HA 26, 94 35, 125
Output MBH 88 117
t
30ºF (17ºC) rise GPM (L/h) 5.9 (1332) 7.8 (1772)*
35ºF (19.5ºC) rise GPM (L/h) 5.0 (1142) 6.7 (1522)*
40ºF (22ºC) rise GPM (L/h) 4.4 (999) 5.9 (1328)
* Requires low loss header or closely spaced tees.
Installation