Gasification wood boiler BLAZE GREEN

Wood gasification boiler

for lump wood, briquettes, wood chips and sawdust

  • Exceptionally ecological wood boiler
  • 4 patents and lambda probe for perfect combustion
  • High efficiency over the entire power range
  • Low fuel consumption, long boiler life
  • Complies with Ecodesign, boiler energy class A+
  • Certified boiler according to ČSN EN 303-5, emission class 5
  • Emission class 5
  • 5 stelle

All BLAZE HARMONY boilers are characterised by significantly lower emission values than required by the CSN EN 303-5 and Ecodesign standards.

However, the BLAZE GREEN boiler pushes the emission limit further when burning lump wood. The newly patented beam nozzle, together with automatic combustion control via a lambda probe, ensures very low emission values.

These are already at the very limit of measurability and are, for example, comparable to condensing gas boilers. And we still burn biomass – a renewable and affordable fuel.

Advantages of a wood
gasifying boiler BLAZE


    Mechanical detection of residual fuel

    This unique system provides automatic stable heat (embers), causing the fan to switch off when the level of the fuel decreases. This accurate detection maintains the hot embers layer in the combustion chamber for several hours, reducing the number of times a new fire is started in the boiler per season.


    Protection against low temperature corrosion

    The built-in thermostat with a temperature setting at 60°C and a special structure for mixing inside the boiler protects the boiler. Option of gravity connection to the buffer tank without pumps. Considerable savings during installation and safe operation. 7-year warranty on the boiler body, with no additional conditions. (Optional accessory for selected boilers)


    Three-way air supply

    Ensures uniform burning of fuel and allows to burn fuels of various dimensions (wood chips, sawdust, briquettes even lower quality). Pre-drying air, which is supplied (if necessary) into the upper part of the chamber will dry up any damp fuel in order to be able to burn it well and maintain high boiler efficiency and low emission values.


    Beam nozzle

    BN and BG models use a special design beam-shaped bottom, which ensures high quality gasification of the fuel with very low emissions. At the same time, it allows operation on chimney draft only.

  5. Corrosion protection with an insulated compact hot chamber system

    Where the walls of the stoking chamber are not directly cooled by water – they are hotter, which prevents condensa-tion. The service life of these boilers is many times longer than that of conventional gasification boilers. It also allows the combustion of moist fuel, without significantly reducing the boiler's service life. The increased temperature of the walls prevents the unpleasant deposition of tar in the stoking chamber. The compact gasification chamber is a separate element that is insulated from the walls of the water boiler. The chamber can be replaced.

  6. Inclined bottom of the gasification chamber

    Provides automatic ash removal from the combustion chamber during combustion, completely eliminating the need to clean it before firing it up again.


Boiler with three-way combustion air supply

Boilers can easily control the distribution of the air entering the fuel (pre-drying air is supplied over the fuel). Therefore the boiler can be adapted to various fuels. This effectively burns fuel that can be easily burn (wood chips, small briquettes), but also fuels that burns hard (large logs, wet wood).

Wood boiler Blaze - Cut

Three-way air supply control

Pre-drying and primary air open at 100 %

Pre-drying and primary air are open at 100 %, secondary air is completely closed. In this position you can find the air supply curtain in case of burning damp wood or big logs.

Secondary air is open at 100 %, pre-drying and primary air completely closed.

Secondary air is open at 100 %, pre-drying and primary air are completely closed. In this position you can find the air supply curtain in case of burning dry wood or briquettes, where is a need for bigger amount of secondary air for high quality combustion.

Primary and secondary air open at 50 %, pre-drying air completely closed.

Primary and secondary air open at 50 %, pre-drying air completely closed. You can find the air supply curtain in this position during combustion of standard fuel.

SEMI-AUTOMATIC operation of the pyrolitic boiler

After 8 hours
Up to 24 hours
After 24 hours
After short time


Stoking - after stoking fuel to whole volume of the stoking chamber the combustion time is up to 8 hours depends on the fuel type and preset boiler output.


After 8 hours - when the fuel level decrease under the detection threshold, then the sensor sends signal and controller switch off the fan. This stops the burning process.


Up to 24 hours from the first fuel stoking, there are still hot coals (embers) in the chamber, so it is sufficient to add directly bigger logs, start the fan and combustion continues.


After 24 hours and more after first fuel stoking there will not be hot coals (embers). There will remains fuel residual in the form of charcoal. In such a case is suifficient to start the fan and with small piece of paper fire up the layer of charcoal.


After short time the charcoal fires up very well. Then it is possible to add even larger pieces of wood. The residual fuel detection mechanism provides user‘s high operation comfort due to lack of new ignitions, when user must clean the boiler and cut small pieces of wood and wait until the boiler ignites successfully.

Dimensions of boiler

Scheme of Wood boiler BLAZE GREEN
  BG 17 BG 24
  mm mm
A 1200 1200
B 530 714
C 400 585
D Ø 149 Ø 149
E 104 104
F 940 940
G 719 719
H 469 469
I 368 368
J 128 128
K 634 634
L 955 955
M 176 176
N G1/2" G1/2"
O G2 1/2" * G2 1/2" *
P G6/4" G6/4"
Q 818 818
R 1317 1317
S 576 760
T 684 868
U 1202 1202
V 850 ** 850 **
W 1038 1038

* cold water inlet to the boiler reduced to 6/4"
** maximum transport dimension after removing the fan

Technical parameters

  BG 17 BG 24
Nominal output (kW) 18 26
Adjustable output (kW) 8,9–18 12,7–26
Efficiency (%) 91 91
Emission class 5.
Ecodesign yes
Energy class A+
Logs length (mm) 330 500
Stocking chamber volume (l) 80 120
Boiler weight (kg) 340 440
Maximal operation pressure (bar) 3 3
Exchanger water volume (l) 40 55


Internet system ecoNET

Internet system ecoNET provides to user option for remote control of the boiler and heating installation. Thanks to that user has possibility to change almost all parameters of boiler and heating system operation, but also view the history of the operation which is is displayed on a clear graph.

Remote acces to controller is possible from every device which is connected to internet, as it is tablet, laptop or mobile phone. Settings can be made via a web browser on or through a mobile application which is available for Android and iOS.

Online service

Online service. The internet system is not only for user. It is useful also for service company, which may have access to the boiler data and if neccessary the service company can change the controller settings. The internet system lowers the costs for service intervention significantly.

Accessories for controller



Remote control panel with room thermostat function ecoSTER TOUCH allows you to control and change the boiler’s settings from the place, where is the thermostat installed, for example the living room.

Internet module

Additional module for controlling another heating circuits

Allows controlling of another two mixing circuit and their pumps. Also it allows to control circulation pump for HDW.

Documents to download

Wood gasification, combined and automatic boilers for wood and pellets