Viessmann Vitodens 100-W User manual

Domestic Product Guide
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

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; this 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 controls 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 from 2007 to 2009 at a cost of 220 million
Euros 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, Gas or Biomass boilers.
For this project, Viessmann received the German Sustainability Award 2009 in the category
"Most Sustainable Production" as well as the German Energy Agency’s Efficiency Award
in 2010. In addition, Viessmann was honoured with the 2011 German Sustainability Award
in the category "Most Sustainable Brand". These awards recognised 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 Combination from page 4
Vitodens 100-W System
Vitodens 100-W Open vent
Vitodens 200-W Combination from page 10
Vitodens 200-W System
Storage combination units from page 14
Vitodens 111-W
Vitodens 222-F
Vitodens 242-F
Viessmann 4-pipe principle page 20
Boiler accessories page 21
Flues from page 22
Controls from page 30
Cylinders from page 34
Solar from page 40
Support services page 47
Training academy from page 48
Contact us page 52
Vitodens technical specification from page 53
High efficiency boilers
2/3

Gas condensing
technology
Vitodens 100-W Combination
NEW
Vitodens 100-W WB1C
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 100-W COMBINATION
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
Highly corrosion resistant
Integral Grundfos AquaBloc hydraulic unit
For easy service and maintenance
Take advantage of these benefits
Same output for Heating and Hot Water
(up to 35 kW)
Combined PRV and condense connection,
saving time and expense
Improved installation options with max.
flue length up to 17 metres
New case design improves service
accessibility and reduces noise and weight
Integral filling loop
Range rate CH to 25% of maximum
output and match output to meet
Building Regulations
Simple conversion to LPG (conversion kit
part no. 7837261 for 26 kW & 7837262 for
30/35 kW)
Integral auto by-pass
Optional sub-mounted mixer kit ideal for
UFH installations
Compact dimensions
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
Output range
Boilers within the range offer the following
outputs of 26 kW, 30 kW, 35 kW
DHW performance
Hot water flow rate up to 14.3 l/min
@35°C rise
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
Save time
and expense
- combined PRV
and condense
connection, for
fast and simple
installation.
4/5

10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW
Gas condensing
technology
Vitodens 100-W System
NEW
Vitodens 100-W WB1C

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
Highly corrosion resistant
Integral Grundfos AquaBloc hydraulic unit
For easy service and maintenance
Take advantage of these benefits
Same output for Heating and Hot Water
(up to 35 kW)
Combined PRV and condense connection,
saving time and expense
Improved installation options with max. flue
length up to 19 metres (19 kW)
New case design improves service
accessibility and reduces noise and weight
Integral auto by-pass
Range rate CH to 25% of maximum
output and match output to meet
Building Regulations
Simple conversion to LPG (conversion kit
part no. 7837261 for 19/26 kW & 7837262
for 30/35 kW)
Compact dimensions
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
Meets G3 building regulations and
saves your time and expense using the
Viessmann 4-pipe principle. (see page 20)
Optional sub-mounted mixer kit ideal for
UFH installations
Output range
Boilers within the range offer the following
outputs of 19 kW, 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
Save time
and expense
- combined PRV
and condense
connection, for
fast and simple
installation.
6/7

Gas condensing
technology
Vitodens 100-W Open vent
NEW 35 kW model
AVAILABLE NOW
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 100-W OPEN VENT
With a depth of only 285 mm (340 mm for
35 kW model) 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
Min static head 2 m
Easy installation
Depth of only 285 mm (340 mm for 35 kW
model) for installation into standard kitchen
wall units
No pump over run required
Output range
Boilers within the range offer the
following outputs of 13 kW, 16 kW, 19 kW,
26 kW, 35 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 Combination
3 year comprehensive
warranty as standard
5 years if fitted by a Viessmann
trained installer
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 200-W COMBINATION
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
Simple & failsafe commissioning of
the boiler
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
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)
Integral auto by-pass
Award winning control unit
The Vitodens 200-W is available*
with either a Vitotronic 100 HC2A
constant temperature controller or the
Vitotronic 200 HO1B 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 HO1B, 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
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

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
Simple & failsafe commissioning of
the boiler
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 or lower temperature
heating circuits (only in conjunction with
Vitotronic 200)
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 HO1B
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 HO1B
heating curve
12/13

Gas condensing
technology
Vitodens 111-W DHW Storage
NEW Wall hung boiler
with integrated DHW cylinder
AVAILABLE NOW
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 111-W DHW STORAGE
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
10 year warranty against corrosion
Durable and efficient through the stainless
steel Inox-Radial heat exchanger
Take advantage of these benefits
High DHW convenience through-loading
system and integrated stainless steel
storage tank (46 litres)
Hot water capability of >18l/min at 35°C
rise, which is equivalent to a 150 litre
unvented cylinder
Output 5.9 to 35 kW
Standard efficiency up to 97%
Built in filling loop
Compact dimensions
All parts accessible from the front
Ideal for low water pressure area
Peak performance up to 200 l/10mins at
temperature rise of 35°C
Simultaneous hot water draw offs
Quick heat recovery <5 mins
Output range
Boilers within the range offer the following
DHW outputs of 26 kW, 35 kW
The Vitodens 111-W delivers large amounts
of hot water in next to no time. A standard
bath (140 litres), for instance, fills in around
eight minutes. A shower fitting, a kitchen
sink or a washbasin, for example, can also
be supplied with water, at the desired
temperature, simultaneously*
Award winning control unit
The controller with built in room
temperature sensor can be connected to
an outside temperature sensor to run in
weather compensation mode
The user-friendly dials allow rapid
adjustment of the heating and domestic
hot water temperatures with a digital
display showing operating conditions and
temperatures.
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.
Warranty
5 year comprehensive warranty
as standard
10 year warranty on the Inox-
Radial heat exchanger
Wall mounted gas fired condensing boiler with integral cylinder for the highest DHW
convenience.
14/15
Heat output (CH) (50/30 °C) kW 6.5 - 26 8.8 - 35
Heat output (CH) (80/60 °C) kW 5.9 - 23.7 8 - 31.7
DHW output kW 29.3 35
Dimensions Depth mm 480 480
(total) Width mm 600 600
Height mm 900 900
Weight kg 62 64
Water content heat exchanger Litre 2.2 2.8
Cylinder volume Litre 46 46
* Subject to cold water pressure and tap flow restrictions
1Pressure guage
2LCD display
3Dial for water temperature
4Dial for central heating
5Off switch with reset function
1
2
34
5
Controller with integrated
diagnostics system
Save time
and expense
- combined PRV
and condense
connection, for
fast and simple
installation.

Gas condensing
technology
Vitodens 222-F DHW Storage
3 year comprehensive
warranty as standard
5 years if fitted by a Viessmann
trained installer
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 222-F DHW STORAGE
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)
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, due to the CLS
Award winning control unit
The Vitodens 222-F is available*
with either a Vitotronic 100 HC2A
constant temperature controller or the
Vitotronic 200 HO1B 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 combined floor standing condensing boiler is designed specifically for
modernising heating systems and replacing older gas fired boilers and DHW cylinders.
Vitotronic 200 HO1B
heating curve
Two cylinder sizes available
100/130 litres
0 2 4 6 8 10
Heating up time [min]
10°C 60°C
Cylinder contents
Cylinder Loading System (CLS)
Save time
and expense
- combined PRV
and condense
connection, for
fast and simple
installation.
16/17

Gas condensing
technology
Vitodens 242-F Solar DHW Storage
2 year comprehensive warranty
10 Year Warranty
on all stainless steel heat exchangers for
gas condensing boilers up to 105 kW

VITODENS 242-F SOLAR DHW STORAGE
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 secondary 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
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, due to the CLS
Award winning control unit
The Vitodens 242-F is supplied as standard
with the Vitotronic 200 HO1B weather
compensation controller with 7 day
programming
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 on
page 46
*Must be ordered separately
This storage combined 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, for 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
Save time
and expense
- combined PRV
and condense
connection, for
fast and simple
installation.
18/19

Viessmann 4-pipe
principle
Vitodens 100-W System
Vitodens 200-W System
Viessmann Vitodens system boilers up to
35 kW installed together with a Vitocell 200
or 300 unvented cylinder are the perfect
combination to meet G3 building regulations
without the need for an energy cut-off valve
and cylinder overheat thermostat; these are
integrated into the boiler.
Installation time will be reduced by up to 1 day
as the following are no longer required:
Energy cut off valve or safety valve
Expansion vessel and pump
Gauge and cylinder overheat thermostat
Part P certification
Compatibility with solar
As a manufacturer of the full range of renewable
energy technologies all Viessmann boilers
are 100% compatible with solar thermal
panels. The Vitodens 100-W range has the
added advantage of boiler suppression, when
using Viessmann solar panels and a dual coil
cylinder. This means that the hot water system
will always take advantage of solar power,
whenever solar energy is available and the
boiler will only fire to ‘top up‘ the DHW heating
process when absolutely necessary – resulting
in significant fuel savings.
Viessmann 4-pipe system
Optional weather
compensation sensor
*
* Cylinder overheat thermostat is supplied as standard for when the cylinder is used without a Viessmann
boiler, but in this installation is obsolete.