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Pellets
Pellets are the most compact form of wood
energy and require the smallest storage
capacity. High calorific value.
Sawdust
Untreated sawdust from sawmills, joineries
and wood-processing facilities.
Mixed wood
Unprocessed mixture of woodchips
and sawdust.
Maximum size: G50.
Woodchips
Shredded, untreated wood, with or without
bark. Large storage capacity required.
Maximum size: G50.
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What you should know
What types of wood can be used?
Kb wood heating systems can be operated
using a wide variety of untreated, high-quality
wood fuels that differ in terms of their calorific
value, required storage capacity and costs
(see page 5).
The type of fuel you choose depends primarily
on the amount of storage capacity available,
the facility's requirements and the availability
of that type of fuel in your area. Since the
quality of the fuel influences the efficiency
and life expectancy of your system, you
should choose good-quality untreated wood
with a low moisture content.
How economical is wood heating?
With a biomass system, approximately 50%
of the total operating costs are accounted for
by fuel costs. Therefore, choosing a high-
performance wood boiler and using high-
quality, affordable wood fuel are both crucial
when it comes to optimising the economy of
your system.
Although the initial outlay for a biomass
system can often be greater than for a
conventional heating system, the savings
made on fuel costs mean that the total cost
of ownership can be less than that for fossil
fuels. So your biomass system works at leastas economically as a heating system for fossil
fuels. However, as your fuel source is home-
grown and independent, your fuel costs will
fluctuate less severely in comparison with
conventional fuels.
Is wood heating safe?
Absolutely. Today's wood heating systems are
just as safe and reliable as the leading oil and
gas heating systems. Equipped with advanced
safety and protection features and digital
control, the system is closely and extensively
monitored and regulated from the supply of
fuel to the heat transfer and ventilation.
Do wood heating systems provide clean
combustion?
Yes! Advanced wood heating systems
achieve similar emission ratings to leading
heating systems for fossil fuels. What's more,
heating with wood is CO2neutral. Kb wood
heating systems meet the strict regulations
set out by the European Anti-Pollution Act.
Where can wood heating systems be used?
Kb wood heating systems are ideal for
commercial and industrial use, such as in
schools, hospitals, district heating networks,
wood-processing plants, etc. They supply
either the entire heating energy for your site or
the base load if it is being operated together
with an oil/gas boiler for peak loads. Thanks to
our comprehensive range of products, you can
expand your biomass system to create a fully
integrated system with Viessmann solar, oil/
gas boilers and individual control technology
(see page 11).
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PYROT
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1 Charging auger (with light barrier)
2 Moving grate
3 Primary air butterfly valve
4 Flue gas return feed
5 Ignition fan
6 Ash removal
7 Secondary air butterfly valve with
rotary fan
8 Rotation combustion chamber
9 Dual heat exchanger
10 Safety heat exchanger
11 Pneumatic pipe cleaning
12 Induced draught fan
Wood boilers with state-of-the-art
technology
With its patented rotation combustion,
the Pyrot boiler is a state-of-the-art wood
combustion system. A charging auger
continuously guides the wood fuel onto a
moving grate on which the fuel gasification
takes place (with a carefully regulated
primary air supply). The combustible gases
then rise up into the rotation combustion
chamber, where they are mixed with
secondary air using a rotary fan. This ensures
complete combustion.
Clean and efficient combustion
The advanced combustion technology in the
Pyrot achieves similar emissions ratings as
those of an advanced gas combustion system
and keeps the release of CO, NOxand dustparticles to a minimum.
Furthermore, unlike oil and gas, wood is a CO2
neutral renewable source of energy. When
operated together with our digital, modulating
output control, the Pyrot boiler achieves an
efficiency level of up to 92%.
Containerised mobile heating centre
(silo as a pellet store)
The Pyrot wood boiler can be available as a
ready-to-use solution in a container for uses
where there are no boiler enclosures available
or where the on-site construction costs have
to be reduced to a minimum. This ready-to-
use solution incorporates the pre-assembled
boiler inside a special container (see page 5)
and all ancillary devices. Individual container
solutions can be specially adapted to meet
your needs.
Innovative wood boiler with rotation combustion, 90 to 480 kW.
For wood fuels with a maximum water content of 35%.
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PYROTEC
1 Slide valve with barrier layer
2 Combustion retort with internal
grate and primary air 1
3 External grate with primary air 2
4 Moving burnout grate
5 Secondary air
6 Ignition fan
7 Ash removal
8 High temperature zone for
complete burnout
9 Combustion chamber door
10 Three-pass boiler (3.0 or 6.0 bar)
11 Safety heat exchanger
12 Pneumatic pipe cleaning
Grate combustion at its best
The Pyrotec boiler uses an underfeed stoker
with a downward external grate and a moving
burnout grate, thereby achieving the best
possible combustion results. A charging auger
guides the wood fuel into the combustion
chamber, where it is pre-dried and degassed
using an accurately controlled primary air
supply (grate combustion). On the external
grate and moving burnout grate, the fuel is
completely degassed. Accurately controlled
secondary air is blown in to ensure complete
combustion of the fuel. In doing so, the
heat is released into the boiler's triple pass
heat exchanger.
Top quality design and construction
The Pyrotec boiler is a top quality construction
for use under the toughest conditions. Theinside of the combustion chamber is fitted
out with high quality firebricks for greater
durability. All grate elements are made of
high quality, thick walled cast chromium steel
and can withstand the highest temperatures.
The Pyrotec boiler has a classic triple pass
heat exchanger for maximum heat transfer
and efficiency.
Clean and efficient combustion
The advanced combustion technology in the
Pyrotec achieves similar emissions ratings as
a modern gas combustion system and keeps
the release of CO and NOxto levels that
correspond to those of an advanced heating
system for fossil fuels. Furthermore, unlike
oil and gas, wood is a CO2neutral, renewable
source of energy. When operated together
with our digital, modulating output control,
the Pyrotec boiler achieves efficiency levels
of up to 92%.
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Wood boiler with state-of-the-ar t grate firing, 390 to 1 250 kW.
For wood fuels with a maximum water content of 50%.
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Benefits at a glance
High efficiency due to advanced combustion technology, triple pass
heat exchanger and modulating output control (modulation range 4:1)
Maximum heat transfer due to triple pass heat exchanger
High efficiency and extremely low emissions thanks to accurately
controlled primary and secondary air
Easy maintenance due to fully automatic ash removal, optional
pneumatic cleaning system and flue gas scrubber
Advanced safety devices ensure safe and reliable operation
Maximum system output due to high performance construction and
supply of all system components from one source
Automatic ignition device prevents idling and saves fuel (option only
for fuels with water content of less than 40%)
Individual planning of your facility by our team of experts
Firebrick lined combustion chamber with external grate and
moving burnout grate
Specification
Fully automatic wood boiler with grate combustion
5 models from 390 to 1 250 kW
For wood fuels with a maximum water content of 50%
Efficiency: up to 92%
Maximum operating pressure: 6 bar
For specification, see page 14.
Pyrotec boiler with charging auger and automatic fire
extinguishing safety system
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Fully automatic and low maintenance
Automatic ash removal(option)
The clean combustion leaves only the
minerals contained in the wood behind as ash.
A moving grate removes the ash from the
combustion chamber and guides it into the
ash container. As soon as they have cooled
down, the ash removal conveyor moves the
ash into a large external container.
Pneumatic cleaning system(option)
A clean heat exchanger is crucial to the life
expectancy and efficiency of a boiler. With
short blasts of compressed air, the pneumatic
pipe cleaning system regularly removes ash
from the heat exchanger, thereby considerably
prolonging the maintenance free operation of
the boiler.
Flue gas return system(Standard for Pyrot, option for Pyrotec)
Flue gas with low oxygen content (6-8%), is
mixed with primary air to ensure the complete
combustion of the fuel. This enables a low
grate temperature, which leads to greater
efficiency of the boiler. In addition, particle
emissions are reduced and the grate's service
life is increased.
Flue gas scrubber(option for pyrot)
The flue gas scrubber minimises dust
emissions by filtering the flue gases froma multicyclone arrangement. It is supplied
completely insulated with a flue gas fan
on the side or the top and a 240 litre ash
container. An 800 litre container is also
available as an option.
(Only necessary for fuels with a high fine particle content,
such as waste wood from wood processing facilities or
woodchips with a fine particle content of > 4%.)
Ash removal conveyor and external ash
container
Pneumatic cleaning system
Flue gas return feed
Flue gas scrubber for compliance
with strict dust emission
requirements
A comprehensive range of system components from a single source for the reliable and
smooth operation of the entire system.
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Comprehensive energy management
Advanced boiler control units for biomass
systems offer the same control convenience
as most standard control units for fossil fuel
systems. Thanks to its modulating output
control and buffer cylinder, the system's flow
temperature can be perfectly adjusted to suit
the weather conditions.
Ecotronic boiler control unit(for Pyrot)
The digital, modulating output control ensures
optimum combustion by accurately controlling
the relationship between the combustion
air, returned flue gas and fuel. The control
unit monitors:
the flow and return temperature of the
boiler
the condition of the firebed
the depth of fuel on the grate
the flue gas temperature
the oxygen content in the flue gas
(Lambda probe)
Pyrocontrol boiler control unit(for Pyrotec)
Fully programmable modulating output and
system control. This boiler has variable speed
control on all fans.
the flow and return temperature of the
boiler
the depth of fuel on the grate
the under grate pressure sensor for reliable
furnace draught the flue gas temperature
the combustion chamber (upper
temperature limit)
the oxygen content in the flue gas
(Lambda probe)
Buffer cylinder
With a biomass system, a buffer cylinder
is an important component for optimum
control accuracy (ability to adapt the system
output to the actual demand). The buffer
cylinder makes it easier to stratify the water
in temperature layers, effectively reduces
frequent cycling of the combustion system
Ecotronic boiler control unit for Pyrot
Boiler control unit for Pyrotec
and adapts the system's flow temperature
to exactly meet the heat demand. With
all control units, there are three or five
sensor inputs available for optimum
burner modulation in accordance with the
temperature of the buffer cylinder.
Vitocontrol multi-boiler control unit
Customer-specific control unit for the
cascading and rotation of two Pyrot or Pyrotec
boilers and the energy management of the
other integrated energy sources (solar, oil/
gas, electric). Controls a common storage and
supply system and provides an interface for
building management systems.
Remote monitoring(option)
Remote monitoring and maintenance of
heating systems via an internet interface.
Enables the monitoring and adjustment
of various system parameters. The
interfaces LonWorksand BACnetfor
local monitoring are available as an option
(further interfaces on request). Ideal for
monitoring systems in public facilities or for
communal/CHP systems.
All control units for biomass
systems are made in-house.
Other benefits are ...
Quick installation with all
functions in one control unit
Simple operation
Modulating high-tech output control for maximum and safe performance of the
heating system.
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Cellar storage with auger discharge
Cellars or former oil storage rooms can be
converted into pellet stores without any major
work. Pellets can be blown across large
distances and special augers transport them
reliably and with low energy consumption.
Pellet stores must be 100% dry.
Bunker with rotating fuel extraction
This is the right solution for square or slightly
rectangular bunkers. An articulated arm
pushes the fuel onto a delivery conveyor.
Bunker with push-floor delivery
Ideal for large, rectangular storage bunkers.
Sliding hydraulic push rods guide the fuel onto
a supply auger. This enables quick filling with
large amounts of fuel.
Silo with funnel
The fuel is supplied from the silo via a
pendulum auger in the funnel safely thanks
to the automatic reversing action. A fire tested
rotary feeder separates the silo from the
heating system. This system is recommended
for wood processing facilities.
Storage and supply systems
Blower air feed systems in interior rooms
Filling small bunkers from above
Filling large bunkers from above
Silo extraction for wood processing operations
All Kb wood heating systems have ...
High-performance augers with large diameter
Spur geared motors for high torque
Large, optimised supply channels A certified device for effective fire protection
Every fuel store and supply system is unique and was constructed for a specific
application. Our advanced, fully automatic supply solutions are delivered ready
for installation.
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Push-floor installation
Reignition protection
Security against reignition through flying
sparks. Permanently present and monitored
barrier layer and permanent, monitored
negative pressure operation.
Burn-back resistant device
A sensor situated in the fuel charging pipe
recognises the danger of burn-back and
immediately counteracts this by increasing the
amount of fuel being charged into the boiler.
Burn-back protection device
A horizontally acting slider with spring return
interrupts the fuel supply in the event of a
power failure and the risk of burn-back. When
there is negative pressure in the fuel store,
a rotary air lock is used in place of the slider
for the same function. The rotary air lock
prevents unwanted leakage air getting into the
combustion process.
Safe and reliable operation
Safety heat exchanger
A safety heat exchanger built into the boiler
is connected to a mains cold water supply
and prevents the boiler from overheating in
the event of a power failure. A non-electric,
thermally activated valve is triggered at
a predetermined boiler temperature and
cools the boiler water down via indirect heat
transfer through the heat exchanger.
Additional safety devices
In addition to the listed safety devices, the
Kb wood boilers can be also equipped with
all safety devices as required by relevant
safety standards.
Low water shutdown
Pressure and temperature sensor
Limited safety temperature
Kb wood heating systems meet the strictest safety requirements.
High-tech safety equipment using state-of-the-ar t technology guarantees
safe and reliable operation of your system at all times.
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Specification
Model Pyrot 100 Pyrot 150 Pyrot 220 Pyrot 300 Pyrot 400 Pyrot 540
Output kW 90 135 200 270 360 480
Efficiency 90% - 92%
Max. operating pressure 3 bar
Dimensions Length 2 192 2 442 2 466 2 822 2 806 3 034
(mm) Width 1 050 1 050 1 330 1 330 1 570 1 570
Height 1 765 1 765 2 024 2 024 2 262 2 332
Weight kg 1 958 2 198 3 024 3 433 4 438 5 108
Model Pyrotec 390 Pyrotec 530 Pyrotec 720 Pyrotec 950 Pyrotec 1250
Output kW 390 530 720 950 1 250
Efficiency 90% - 92%
Max. operating pressure 6 bar
Dimensions Length 3 269 3 237 3 877 3 835 4 380
(mm) Width 1 238 1 380 1 380 1 612 1 612
Height 2 382 2 702 2 834 3 035 3 230
Weight kg 4 650 6 945 8 244 10 653 12 083
PYROT
Boiler with rotation combustion
For wood fuels with a water content of < 35%
PYROTEC
Boiler with grate combustion
For wood fuels with a water content of < 50%
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Perfectly matched to suit your system
1 Viessmann bespoke
control panel2 Solar thermal system
3 Wood heating system
4 Condensing boilers
5 Low temperature boiler
6 DHW cylinder
7 System distribution
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Wood boilers are ideal for integrating with one
or more sources of energy, such as fossil fuels
or solar thermal energy. Our comprehensive
range of products offers heating systems
for all forms of energy, designed to form
seamlessly integrated heating solutions.
Whether it is an oil/gas boiler or a solar
thermal system, all parts fit together perfectly
and form a reliable and economical system.
High performance solar thermal systems
Our high performance solar thermal systems
with flat-plate or vacuum tube collectors are
ideal for the supply of DHW and as central
heating backup for your biomass system.
Incorporating solar energy into your heating
system enables you not only to reduce your
costs for generating domestic hot water
by up to 60% (depending on the size of
the solar thermal system), you also benefit
the environment.
High performance DHW cylinders
The Vitocell DHW cylinders for indirect heating
enable a quick, plentiful and reliable supply of
DHW at all times. For applications requiring
large amounts of DHW, the vertical and
horizontal DHW cylinders can be combined to
create cylinder banks. By integrating the DHW
supply into your wood heating system, you can
save up to 50% of the running costs compared
to directly heated DHW.
Proven boilers
In an integrated system working with
renewables, wood heating is often connected
to a conventional oil/gas boiler that covers
peak loads or backs up the biomass boiler.
Depending on the type and temperature
demand of your system, Viessmann offers
highly efficient steel and cast iron condensingboilers and non condensing boilers.
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With Viessmann system technology, you can easily expand your wood heating systems
and enjoy all the benefits in an integrated system working with renewables.
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Wood heating systems in operation
Portable building package
Harney District Hospital
Burns, Oregon, USA
Kb wood heating systems
Kb has been installing commercial
wood heating systems for more than
30 years. During that time it has achieved
significant recognition for its innovative and
environmentally responsible products. Kb is
part of the Viessmann Group, which supplies
innovative high performance heating systems
and systems for renewables.
Planning and commissioning service
Each Kb installation begins with a system
plan devised by our own team of experts.
We examine the special requirements and
conditions of your project and provide you
with a bespoke system solution from
individual wood burning boilers to a fully
integrated system for heating with fossil fuels
and a solar thermal system.
Comprehensive system solutions and service
from one source.
More than 1 500 systems around the world operate with wood heating systems from Kb.
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Pyrotec installation
Brunstad Congress Center,
Norway
Cambomare leisure centre,
Kempten, Germany
Pyrot
Hotel Lagorai Cavalese Italy
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The company
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For three generations, the Viessmann family business has been committed to generating
heat conveniently, economically, with environmental responsibility and in accordance
with demand.
The Viessmann Group
With a number of outstanding product
developments and problem-solving solutions,
Viessmann has created milestones which
have frequently made them the trailblazer and
trendsetter for their entire industry.
Viessmann's orientation is decidedly
international it maintains 16 factories in
Germany, Austria, France, Canada, Poland,
Hungary and China, sales organisations in
Germany and 35 other countries, plus
120 sales offices around the world.
Group member companies
Viessmann is a family business that has
financed its growth almost exclusively
with its own resources. In more recent
times, company takeovers too have
contributed to our growth. Today, members
of the Viessmann Group include the wood
combustion specialists Kb and Mawera,
the heat pump manufacturer KWT, the
manufacturer of combined heat and power
units ESS, and BioFerm, a market leader in
biogas systems.
Skilful workforce
Initial and ongoing training is becoming ever
more important. As long ago as the 1960s,
we set ourselves the task of offering aprogramme of further tailor-made training to
our skilled contractors.
Today Viessmann maintains a modern
information centre at its company head office
in Allendorf (Eder), that is second to none.
Every year at the Viessmann academy, more
than 70 000 contractors bring their knowledge
right up-to-date.
The energy centre of the future
Viessmann has built an energy centre in
line with a homogenous climate protection
concept. This centre is equipped exclusively
with environmentally responsible technology.
This includes the generation of energy, its
use and environmentally friendly production
in the Allendorf (Eder) factory. As a result,
the amount of fossil fuels consumed at the
factory has been cut by 40 percent compared
to previous levels, and CO2emissions have
been reduced by a third.
Responsibility
Viessmann is committed to fulfilling its
environmental and social responsibilities.
Viessmann employees form a team acting
on a global footing. This team is defined by
the loyalty, reliability and the responsible
actions of each individual. We ensure all our
processes are environmentally compatible
and encourage the use of renewable forms
of energy. Furthermore we take an interest ineconomics, art and culture and have for many
years engaged in successful international
sport sponsorship.
Viessmann Group
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