Viessmann Vitodens 100-W User manual

Domestic Product Guide

Introduction
Established in 1917, Viessmann draws on more than 90 years of experience in the
development and manufacture of heating systems and due to its high commitment to
quality, it is Europe's single largest brand in heating technology. Viessmann is a third
generation family business and as such is able to hold true to its principles of innovation,
efficiency and sustainability; which is a significant reason behind Viessmann's
continuing success.
Viessmann's domestic product range has been built around a long established reputation for
high quality commercial heating systems. Viessmann has utilised its extensive knowledge
and expertise to develop domestic heating products that define the quality benchmark
for other brands. Viessmann manufactures all of its own products and most controllers
to ensure that the drive for quality remains throughout the entire range and that there are
additional benefits from combining its heating technologies. Viessmann produces and sells
products in the following sectors: high efficiency boilers, both domestic and commercial;
solar thermal flat plate and tube collectors and PV panels; air source and ground source heat
pumps; biomass boilers; and CHP units for commercial and domestic use, using a number of
fuels including biogas.
However the principles of innovation, efficiency and sustainability don't only apply to
products, but extend to all areas of the business. Viessmann's head office and production
facility in Allendorf, Germany, was restructured in 2007 and energy use was aligned with
European climate change goals, of a 20% reduction in energy usage and CO2 emissions
and a transfer of 20% of energy production into renewables, by 2020. In 2009, under the
umbrella of the 'Efficiency Plus' project, Viessmann achieved its goal of saving 40% of oil,
gas and electricity through the use of renewable energy while at the same time reducing
CO2emissions by a third. Almost all measures to improve efficiency and renewable
substitution were achieved with commercially available products made by members of the
Viessmann Group; whether these were Solar panels, CHP units, Oil or Biomass boilers.
As a result of our efforts, Viessmann has been presented with the 2009 German
Sustainability Award, Deutscher Nachhaltigkeitspreis in the category "Most Sustainable
Production facility" for the main factory in Allendorf where high efficiency gas boilers for
the UK are manufactured. This award honours the company's achievement of combining
economic success with social responsibility and environmental conservation. Hence
Viessmann products contribute to reducing the carbon footprint of UK homes even before
they are installed.
Leading heating technology from Europe's largest brand -
manufactured in Germany's most sustainable factory
Viessmann
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Contents
Vitodens 100-W Combi from page 4
Vitodens 100-W System
Vitodens 100-W Compact
Vitodens 200-W Combi from page 10
Vitodens 200-W System
Storage combi units from page 14
Vitodens 222-F
Vitodens 242-F
Boiler accessories from page 18
Flues from page 20
Controls from page 28
Cylinders from page 32
Solar from page 38
Support services page 45
Training academy from page 46
Contact us from page 48
Vitodens technical specification from page 50
High efficiency boilers
2/3

Gas condensing
technology
Vitodens 100-W Combi
Comprehensive
warranty as standard

VITODENS 100-W COMBI
The Vitodens 100-W high efficiency
gas condensing boiler, manufactured by
Viessmann in Germany, is loaded with
features for easy installation, high efficiency
and impressive fuel savings.
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Inox-Radial heat exchanger
Excellent corrosion resistance
Self-cleaning
Counteracts dirt and sludge deposits
10 year warranty against corrosion
Integral Grundfos AquaBloc hydraulic unit
For easy service and maintenance
Take advantage of these benefits
Heating circuit pump and integral
expansion vessel
For natural gas and LPG (conversion kit
part no. 7828769)
Permissible boiler operating pressure 3 bar
SEDBUK (2005) seasonal efficiency 90%
Modulation ratio of 1:3, e.g. 9 kW to 26 kW
Room thermostatic and weather
compensated control unit options
DHW flow rate of up to 14 l/min
Pre-heat facility for better hot
water comfort
Comprehensive flue options
Easy installation
Safety valves and fittings
Fully assembled and wired
Boiler flue connection
Hydraulic accessories
Gas tap
Installation aids are available such as
pre-plumbing jig and rear-piping frames,
please see boiler accessories
DHW output range
Boilers within the range offer the following
outputs of 26 kW, 30 kW, 35 kW
Controls
User control interface with large LCD
Plug in controls for wireless operation
Optional weather compensation control
for additional gas savings of up to 12%
Warranty
5 year comprehensive warranty
as standard
10 year warranty on the Inox-Radial
heat exchanger
Wall mounted gas fired condensing boiler, with modulating MatriX cylinder burner
and Inox-Radial heat exchanger, for open and balanced flue operation with integral
expansion vessel.
Inox-Radial heat exchanger
4/5

Gas condensing
technology
Vitodens 100-W System
Comprehensive
warranty as standard

VITODENS 100-W SYSTEM
The Vitodens 100-W high efficiency gas
condensing boiler, manufactured by Viessmann
in Germany, is loaded with features for easy
installation, high efficiency and impressive
fuel savings.
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Inox-Radial heat exchanger
Excellent corrosion resistance
Self-cleaning
Counteracts dirt and sludge deposits
10 year warranty against corrosion
Integral Grundfos AquaBloc hydraulic unit
For easy service and maintenance
Take advantage of these benefits
Heating circuit pump and three-way diverter
valve (4-pipe connection)
For natural gas and LPG (conversion kit part
no. 7828769)
Permissible boiler operating pressure 3 bar
SEDBUK (2005) seasonal efficiency 90.3%
Modulation ratio of 1:3, e.g. 9 kW to 26 kW
Room thermostatic and weather
compensated control unit options
Compatible with solar thermal panels
Easy installation
Safety valves and fittings
Fully assembled and wired
Boiler flue connection
Hydraulic accessories
Gas tap
Installation aids are available such as
pre-plumbing jig and rear-piping frames,
please see boiler accessories
Installation with a Vitocell 200 or 300
cylinder meets G3 Building Regulations
without the need for an energy cut-off
valve and cylinder overheat thermostat;
these are now built into the boiler. Instead
a DHW temperature sensor (sensor part
no. 7179114) fitted to the cylinder takes
over the hot water control
Optional sub-mounted mixer kit ideal for
UFH installations (only in conjunction with
Vitotronic 200)
CH output range
Boilers within the range offer the following
outputs of 26 kW, 30 kW, 35 kW
Controls
User control interface with large LCD
Plug in controls for wireless operation
Optional weather compensation control for
additional gas savings of up to 12%
Warranty
5 year comprehensive warranty
as standard
10 year warranty on the Inox-Radial
heat exchanger
Wall mounted gas fired condensing system boiler, with modulating MatriX cylinder
burner and Inox-Radial heat exchanger, for open and balanced flue operation with
integral expansion vessel.
MatriX cylinder burner
100-W showing components
DHW
sensor
Vitotrol 100
Radiator
4-pipe hydraulic system schematic
6/7

Gas condensing
technology
Vitodens 100-W Compact
Comprehensive
warranty as standard

VITODENS 100-W COMPACT
With a depth of only 285 mm the Vitodens
100-W Compact boiler is perfectly suited for
integration into standard kitchen cupboards.
It can also be used in a vast number of other
applications where there is only limited
space available.
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Inox-Radial heat exchanger
Excellent corrosion resistance
Self-cleaning
Counteracts dirt and sludge deposits
10 year warranty against corrosion
Take advantage of these benefits
For natural gas and LPG (conversion kit
part no. 7828769)
Permissible boiler operating pressure 3 bar
SEDBUK (2005) seasonal efficiency 90.8%
Modulation ratio of 1:3
Room thermostatic and weather
compensated control unit options
Easy installation
Depth of only 285 mm for installation
into standard kitchen wall units
No pump over run required
CH output range
Boilers within the range offer the following
outputs of 13 kW, 16 kW, 19 kW, 26 kW
Warranty
5 year comprehensive warranty
as standard
10 year warranty on the Inox-Radial
heat exchanger
Wall mounted gas fired condensing boiler, with modulating MatriX cylinder burner
and Inox-Radial heat exchanger, for open and balanced flue operation and open
vented heating systems.
Compact dimensions suitable
for standard kitchen wall units
8/9

Gas condensing
technology
Vitodens 200-W Combi
3 year comprehensive
warranty as standard
5 years if fitted by a Viessmann
trained installer

VITODENS 200-W COMBI
The Vitodens 200-W is loaded with
features and functions to make installation,
fault-finding and servicing easy.
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Low emissions
Long service life through stainless steel
MatriX gauze
Optimum matching of heat exchanger
and burner
Inox-Radial heat exchanger
Self-cleaning smooth stainless
steel surface
Same flow direction for flue gas
and condensate
Highly corrosion resistant through
high-grade stainless steel (type SS 1.4571)
10 year warranty against corrosion
Lambda Pro Control combustion controller
No nozzle change when converting to LPG
Consistently high efficiency even
with fluctuating gas composition and
air pressure
Constantly clean combustion
Low combustion noise through low
fan speed
Optimised efficiency throughout its life
Dynamic burner cycling
Adjusts the burner firing duration according
to the seasonal heating requirements to
ensure the burner burns for longer and
less frequently, to increase efficiency and
reduce operational wear and tear, e.g.
during Spring and Autumn when heating
requirement is reduced
Easy installation
Fully assembled and wired
Comes with pre-plumbing jig as standard
DHW output range
Boilers within the range offer the following
outputs of 26 kW, 30 kW, 35 kW
Take advantage of these benefits
Integral DHW heating (comfort control)
Low energy heating circuit pump (2 speed)
and integrated diverter valve
Optional high efficiency A rated
modulating pump
For natural gas and LPG (the conversion to
LPG is made at the gas valve – a conversion
kit is not required)
Permissible boiler operating pressure 3 bar
SEDBUK (2005) seasonal efficiency 90.6%
Wide modulation ratio of 1:4, e.g. 6.5 kW to
26 kW, ensures optimised
burner operation
10 litre expansion vessel
High DHW flow rate of up to 14 l/min
(@ 35°C rise)
Award winning control unit
The Vitodens 200-W is available*
with either a Vitotronic 100 HC2A
constant temperature controller or the
Vitotronic 200 HO1A weather
compensation controller, both controls
have a 7 day programmer
Navigation is as easy as can be and
mirrors the well known scroll wheel you
are familiar with from mobile phones or TV
remote controls
Features a multi-line plain text display with
large fonts
Display is 70% larger than those of
comparable devices, can show graphics
and is also back-lit
The Vitotronic 200 HO1A, used with
an outdoor sensor, can control up to 3
heating circuits, 2 mixed and 1 unmixed,
e.g. underfloor heating and radiators would
be run off the mixed circuit and a towel rail
would run off an unmixed circuit and a
separate DHW Circuit
*Must be ordered separately
Wall mounted gas fired condensing boiler, with modulating MatriX cylinder
burner and Inox-Radial heat exchanger, for open and balanced flue operation.
10 /11
Vitotronic 100 HC2A
Constant temperature control

Gas condensing
technology
Vitodens 200-W System
3 year comprehensive
warranty as standard
5 years if fitted by a Viessmann
trained installer

VITODENS 200-W SYSTEM
The Vitodens 200-W is loaded with
features and functions to make installation,
fault-finding and servicing easy.
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Low emissions
Long service life through stainless steel
MatriX gauze
Optimum matching of heat exchanger
and burner
Inox-Radial heat exchanger
Self-cleaning smooth stainless
steel surface
Same flow direction for flue gas
and condensate
Highly corrosion resistant through
high-grade stainless steel (type SS 1.4571)
10 year warranty against corrosion
Integral Grundfos AquaBloc hydraulic unit
For easy service and maintenance
Lambda Pro Control combustion controller
No nozzle change when converting to LPG
Consistently high efficiency even
with fluctuating gas composition and
air pressure
Constantly clean combustion
Low combustion noise through low
fan speed
Optimised efficiency throughout its life
Dynamic burner cycling
Adjusts the burner firing duration according
to the seasonal heating requirements to
ensure the burner burns for longer and
less frequently, to increase efficiency and
reduce operational wear and tear, e.g.
during Spring and Autumn when heating
requirement is reduced
Take advantage of these benefits
Low energy heating circuit pump
(2 speed) and integrated diverter valve
(for the connection of a DHW cylinder)
Optional high efficiency A rated
modulating pump
For natural gas and LPG (the conversion
to LPG is made at the gas valve – a
conversion kit is not required)
Permissible boiler operating pressure 3 bar
SEDBUK (2005) seasonal efficiency 90.7%
Wide modulation ratio of 1:4, e.g. 6.5 kW
to 26 kW, ensures optimised burner
operation
10 litre expansion vessel
Can be electronically interlocked
with Vitosolic controller for optimum
solar efficiency
Easy installation
Fully assembled and wired
Comes with pre-plumbing jig as standard
Installation with a Vitocell 200 or 300
cylinder meets G3 Building Regulations
without the need for an energy cut-off
valve and cylinder overheat thermostat;
these are now built into the boiler.
Instead a DHW temperature sensor (sensor
part no. 7179114) fitted to the cylinder takes
over the hot water control
Optional sub-mounted mixer kit ideal for
UFH installations (only in conjunction with
Vitotronic 200)
CH output range
Boilers within the range offer the following
outputs of 19 kW, 26 kW, 30 kW, 35 kW
There are higher output models available
where there is a higher heat demand or
for commercial applications, with outputs
of 45 kW, 60 kW, 80 kW, 105 kW. These
units can be cascaded to provide a total
output up to 420 kW
Award winning control unit
The Vitodens 200-W is available*
with either a Vitotronic 100 HC2A
constant temperature controller or
the Vitotronic 200 HO1A weather
compensation controller, both
controls have a 7 day programmer
*Must be ordered separately
Wall mounted gas fired condensing system boiler, with modulating MatriX cylinder
burner and Inox-Radial heat exchanger, for open and balanced flue operation.
Vitotronic 200 HO1A
heating curve
12/13

Gas condensing
technology
Vitodens 222-F Storage Combi
3 year comprehensive
warranty as standard
5 years if fitted by a Viessmann
trained installer

VITODENS 222-F STORAGE COMBI
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Low emissions
Long service life through stainless steel
MatriX gauze
Optimum matching of heat exchanger
and burner
Inox-Radial heat exchanger
Self-cleaning smooth stainless steel surface
Same flow direction for flue gas
and condensate
Highly corrosion resistant through
high-grade stainless steel (type SS 1.4571)
10 year warranty against corrosion
Durable and efficient through the stainless
steel Inox-Radial heat exchanger
MatriX cylinder burner with Lambda Pro
combustion control for permanent high
efficiency and clean combustion
Take advantage of these benefits
Two cylinder sizes, 100 litres and 130 litres
for best hot water performance
DHW expansion vessel and DHW
circulation pump can be integrated inside
the appliance
Dynamic burner cycling reduces the number
of burner starts over the year by a third
SEDBUK (2005) seasonal efficiency 91%
Wide modulation ratio of 1:4, e.g.
6.5 kW to 26 kW, ensures optimised
burner operation
For natural gas and LPG (conversion
is made on valve settings and
controller coding)
Includes unvented safety kit and DHW
expansion vessel
Standard top connection set*
Standard RH or LH side connection set*
Easy installation
Optional connection set for top level
(7348566) or side pipe installation (7350854)
No side clearance required, boiler stands
flush to the wall
Optional built-in hot water circulation
pump for secondary turn circuit (Part No.
7351819 DHW Secondary Circuit kit)
CH output range
Boilers within the range offer the following
DHW outputs of 19 kW, 26 kW, 35 kW
Flow rates are up to 20 l/min
On the 35 kW model a 10 minute peak
flow performance provides 200 litres of
60°C hot water which is equivalent to
a larger cylinder
Award winning control unit
The Vitodens 222-F is available*
with either a Vitotronic 100 HC2A
constant temperature controller or the
Vitotronic 200 HO1A weather
compensation controller, both controls
have a 7 day programmer
The control can be sited up to 5 m
away from the boiler enabling installation
in areas with restricted access, e.g. if
the boiler is installed in a garage or loft
Cylinder Loading System (CLS)
Most unvented cylinders use a heating coil
to heat up the cylinder. The CLS technology
replaces the coil with a plate heat exchanger.
A DHW pump circulates the cold water from
the bottom of the cylinder, through the plate
heat exchanger and puts the hot water back
to the top of the cylinder.
*Must be ordered separately
This storage combination floor standing condensing boiler is designed specifically for
modernising heating systems and replacing older gas fired boilers with DHW cylinders.
0 2 4 6 8 10
Heating up time [min]
10°C 60°C
Cylinder contents
Vitotronic 200 HO1A
heating curve
Two cylinder sizes available
100/130 litres
Cylinder Loading System (CLS)
14/15

Gas condensing
technology
Vitodens 242-F Solar Storage Combi
2 year comprehensive warranty

VITODENS 242-F SOLAR STORAGE COMBI
MatriX cylinder burner
Patented technology, manufactured
by Viessmann
Low emissions
Long service life through stainless steel
MatriX gauze
Optimum matching of heat exchanger
and burner
Inox-Radial heat exchanger
Self-cleaning smooth stainless steel surface
Same flow direction for flue gas
and condensate
Highly corrosion resistant through
high-grade stainless steel (type SS 1.4571)
10 year warranty against corrosion
Durable and efficient through the stainless
steel Inox-Radial heat exchanger
MatriX cylinder burner with Lambda Pro
combustion control for permanent
high efficiency and clean combustion
Take advantage of these benefits
Can reduce your hot water energy usage
by 60%
Unvented cylinder with 170 litre
capacity and solar indirect coil
DHW circulation pump can be integrated
inside the appliance
Dynamic burner cycling reduces the
number of burner starts over the year
by a third
SEDBUK (2005) seasonal efficiency 91%
Wide modulation ratio of 1:4, e.g.
6.5 kW to 26 kW, ensures optimised
burner operation
For natural gas and LPG (conversion
is made on valve settings and
controller coding)
Factory fitted cylinder solar pump
Unvented safety kit and DHW
expansion vessel
Standard top connection set
Standard RH or LH side connection set
Easy installation
Optional connection sets for top level
(7348552) or side pipe installation*
(7347985)
No side clearance required, boiler stands
flush to the wall
All components are factory assembled and
wired, saving installation time
CH output range
Boilers within the range offer the following
DHW outputs of 19 kW, 26 kW, ideal
for refurbishments
Flow rates are up to 20 l/min
Award winning control unit
The Vitodens 242-F is available
with the Vitotronic 200 HO1A weather
compensation controller with a 7
day programmer
The control can be sited up to 5 m
away from the boiler enabling installation
in areas with restricted access, e.g. If the
boiler is installed in a garage or loft
Cylinder Loading System (CLS)
Most unvented cylinders use a heating coil
to heat up the cylinder. The CLS technology
replaces the coil with a plate heat exchanger.
A DHW pump circulates the cold water from
the bottom of the cylinder, through the plate
heat exchanger and puts the hot water back
to the top of the cylinder.
Solar options
Comprehensive range of complete solar
packs offered, please see solar kits
*Must be ordered separately
This storage combination floor standing condensing boiler is designed specifically for direct
connection to a solar thermal system. Incorporating three technologies in one; gas condensing
boiler, DHW cylinder and solar control package, where space is at a premium.
The graphic display of the new
Vitotronic control unit can also
display the solar yield
Cylinder in 242-F includes solar coil
16/17

BOILER ACCESSORIES
Condensate pump
Technical data
Supply voltage 100 - 240 Volt
Power consumption P1 25 Watt
Current draw 0.2 - 0.1 A
Protention class IP 44/Class F
Acid resitance pH2 or higher
Pump Electronically commutated spherical motor with permanent magnet rotor/impeller
Max. pump head 54 kPa
Max. flow rate 460 I/h
Noise level (Lw) 46 (dB(a))
Max. system temperature +60°C
Min. ambient temperature non-freezing
Safety contact Relay open when triggered, capacity 250 VA
Tank volume 0.7I (usable volume 0.5I)
Package dimensions 215 x 215 x 180 mm
Package weight 1.6 kg
Part no. 7374796
Installation
accessories
Vitodens 100-W
Vitodens 200-W
Vitodens 222-F/242-F
The condensate pump is required for low level
boiler installation where the condensate for
removal has to be pumped upwards.
The condensate pump is also equipped with
an alarm switch (potential free contact) which
can be used to switch off the condensing
boiler/ASHP to prevent the condensate
tank from overflowing. Separate alarm LED
indicators are also fitted to the pump.

Pre-plumbing jig
Includes fixing parts, valves/fittings,
gas tap and valve/fittings cover
Included with 200-W as part of the
standard delivery
Rear pipework mounting frame
Includes pipe tails and fittings cover.
Valves and fittings as well as gas tap are
already supplied with the boiler
Valve/fittings cover
Toolset
A range of Vitoset accessories is available to make Vitodens boiler installations easier.
These include a pre-plumbing jig and a rear pipework mounting frame, where pipework
can run vertically behind the boiler.
Product description Output Part no.
Vitodens 100-W Combi 26 kW 7262166
Vitodens 100-W Combi 30 kW - 35 kW 7262167
Vitodens 100-W System 26 kW 7262163
Vitodens 100-W System 30 kW - 35 kW 7262168
Product description Output Part no.
Vitodens 100-W Combi & System 26 kW 7193965
Vitodens 100-W Combi & System 30 kW - 35 kW 7296418
Vitodens 200-W Combi & System 19 kW - 35 kW 7197599
Product description Output Part no.
Vitodens 100-W Combi & System 26 kW 7299294
Vitodens 100-W Combi & System 30 kW - 35 kW 7299418
Product description Part no.
Case for all tools required for maintenance and service of all Viessmann Vitodens boilers 9537070
18/19

Flue location
and ventilation
Vitodens 100-W
CE-0085 BN
Vitodens 200-W
CE-0085 BR 0432
Vitodens 222-F
CE-0085 BR 0433
Vitodens 242-F
CE-0085 BO 0338
Please note
This is to confirm that the flue system
is approved to Building Regulations and
certified to the appropriate EC Gas
Equipment Directive. Manufacturers
instructions must not be taken in any
way as overriding statutory obligations.
System Certification
System certification to DVGW-VP 113 and
EC Gas Equipment Directive 90/396/EEC
in conjunction with PPs flue pipes offered
by Skoberne.
Statutory requirements
The appliance is suitable only for installation
in GB and IE and should be installed in
accordance with the rules in force. In GB a Gas
Safe Registered installer must carry out the
installation. It must be carried out in accordance
with the relevant requirements of the – Gas
safety (installation and use) regulations (current
issue). It is in your own interest and safety to
ensure that the law is complied with.
In addition to the above regulations, this
appliance must be installed in accordance
with the current IEE Wiring Regulations for
electrical installation (BS 7671), local Building
Regulations, the Building Standards (Scotland)
(Consolidation) Regulations, bye laws of the
local water undertaking and Health and Safety
Document NO. 635 'The Electricity at Work
regulations 1989' In Ireland (IE), the installation
must be carried out by a Competent Person
and installed in accordance with the current
edition of I.S.813 "Domestic Gas Installations",
the current Building Regulations and references
should be made to the current ETCI rules for
electrical installation.
It should also be in accordance with the relevant
recommendations in the current editions of
the following British Standards and Codes of
Practice: BS 5449, BS 5546, BS 5440:1, BS
5440:2, BS 6798, BS 7593, BS 6891, IGE/UP/7
and IS 813 for IE.
All Registered installers are required to notify
building control when they have installed or
exchanged a gas appliance in a residential
dwelling. This can be done via Gas Safe.
Boiler Position
The following limitations must be observed
when siting the boiler:
The boiler is not suitable for external
installation. The position selected for the
installation should be within the building,
unless otherwise protected by a suitable
enclosure and must allow adequate space
for installation, servicing and operation
of the appliance and for air circulation
around it.
The position must allow for a suitable flue
system and terminal position. The boiler
must be installed on a flat vertical
wall capable of supporting the weight of
the appliance and any ancillary equipment
when full.
Due consideration should be given to the
routing of the condensate drain from the
chosen position.
If the boiler is to be fitted in a timber
framed building it should be fitted in
accordance with ige/up/7. If in doubt
advice must be sought from the Institute
of Gas Engineers.
General boiler installation requirements
If the appliance is to be installed in a room
containing a bath or shower, any electrical
switch or control utilising mains electricity
must be so situated that it cannot be
touched by a person using the bath or
shower. Attention is drawn to the
requirements of BS 7671 (the current
I.E.E Wiring Regulations) and in Scotland
the electrical provisions of the Building
Regulations applicable in Scotland.
A compartment used to enclose the
appliance must be designed and
constructed specifically for this purpose.
An existing cupboard or compartment may
be used provided it is modified accordingly.
BS 7698:2000 gives details of the essential
features of cupboard/compartment
design, including airing cupboards. The
Vitodens range does not require
compartment ventilation.
Where installation will be in an unusual
location, special procedures may be
necessary. BS 6798 gives detailed
guidance on this subject.
General installation