Wood gasifying boiler 25 kW to 30kW (biomass) BURNiT PyroBurn Lambda


4 994,66 € tax incl.


A highly-efficient wood gasifying boiler, designed for economical and ecological heating of medium to large-sized premises (25 or 30kW). The BRUNiT PB Lambda boiler provides intuitive operation interface, heat output regulation, cleaning system and Lambda oxygen sensor as well as sophisticated safety systems.

Made in Europe

Available on order

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Boiler PyroBurn Lambda


Thanks to the integrated lambda sensor the combustion process is optimized to such an extent that boiler efficiency exceeds 91%, and exhaust gas emissions conform to strictest EU standards. The water mantle embraces the combustion chamber in full to utilize the emitted heat most efficiently.
Built-in high temperature ceramic plates ensure uniform heat distribution and protection of the water mantle from the extreme heat produced by wood gasification (up to 1200°C).

Tested and approved according to EN 303-5, class 5.

Boiler warranty : 2 years

Wood gasification.

The wood in the primary burning chamber is fired in a low-oxygen environment reaching about 580°С. It starts degrading to a combustible gas of carbon compounds which is directed to the orifice of the secondary combustion chamber. There, the gas is enriched with secondary air and ignites to reach temperature of up to 1200°C.
Before leaving the boiler body, the gas passes through a flue with built-in spiral turbulators where it gives away its heat to the water mantle and cools down to 150°С. Thanks to the wood gasification principle the fuel is most efficiently consumed with minimum carbon emissions and ash.

1.Incoming air;
2.Primary air
3.Secondary air;
4. Ignition;
5. Pyrolysis combustion;
6. Fume exhaust fan;
7. Flue

Product Features


  • The microprocessor control is able to control operation of buffer tank and one DHW circuit through the built-in terminals for connecting circulation pumps and DHW sensor.
  • Lambda sensor for accurate combustion process management.
  • Cleaning system (manual).
  • Fume exhaust fan.
  • Exhaust gas sensor.
  • Open door sensor and fume extraction opening chamber keeps smoke from polluting the boiler room during reloading. Open door sensor detects when boiler door is open and activates fume extractor fan on full speed (100%). Fume extractor fan draws smoke from the chamber to the chimney via back-side upper chamber opening.
  • Actuator-driven air flaps for air intake management.
  • Large firebox door ensures easy loading even with bigger logs (length of logs up to 50 cm).
  • Combustion chamber protected on all sides by ceramic plates.
  • Eyepiece for viewing the combustion process

Safety devices


  • Upon reaching 90°С the controller turns the fan off and activates the pumps for domestic hot water and heating system. An independent STB thermostat shuts down the fan upon reaching 95°С.
  • Safety heat evacuator;
  • Pressure relief valve 3 bar;

Boiler PyroBurn Lambda elements
1. Controller
2. Housing
3. High efficiency thermal insulation
4. Safety heat evacuator
5. Water mantle (jacket)
6. Wood-loading chamber
7. Pyrolysis combustion chamber
8. Cleaning system
9. Hot water outlet
10. Flue gas sensor
11. Lambda sensor
12. Flue
13. Flue gas extraction fan
14. Actuator-driven primary air flap
15. Actuator-driven secondary air flap
16. Cold water inlet

Technical specifications

Chart elements boiler PyroBurn Lambda


PyroBurn Lambda2530
Nominal heat output / Min-Max heat outputkW25 / 22-2730 / 27-32
Mass flow of exhaust gases, Max. heat outputkg/s0.0170.021
Height Hmm12851435
Width L x Depth Dmm675 x 1130765 x 1130
Water mantle volumeL7585
Combustion chamber volumeL98143
Required chimney draughtPa/mbar10-15 / 0.10-0.1510-15 / 0.10 - 0.15
Insulation boilerHigh-efficiency thermal wool
Insulation chamberCeramic plates
Insulation doorsHigh-efficiency thermal wool + ceramic plates
Average power consumptionW200200
Electric power supplyV/Hz230/50230/50
Recommended fuelWood, humidity 15%, wood briquettes
Burning time partial / full loadh10 / 614 / 8
Fuel consumption for heating season10 / 2015 / 23
Loading door sizemm490 / 200490 / 260
Max. length of firewood logsmm500500
Recommended size of buffer tankL10002000
Exhaust gas temperature (operation mode)°C130-150130-150
Operating temperature range°C65-8565-85
Min. return water temperature°C6060
Operating pressurebar33
Cold water inletA, mmG1¼"/160G1¼"/170
Hot water inletB,mmG1¼" / 1180R1¼" / 1325
Sleeve for sensor of safety valveKYes
Safety heat evacuator inlet/outletE, mmR½"/1090R½"/1235
FlueF, ø / mmø150 / 1000ø150 / 1135
J, mm338382
DrainY, mmR½" / 87R½" / 100
Cleaning opening upper01,mm400 / 140455 / 200
Cleaning opening lower02, mm350 / 140350 / 140
Air intake flap - primary airV1, mm595655
Air intake flap - secondary airV2, mm440515
Step-regulated motor / servo-actuatorM1, mm595655
M2, mm440515
Fume exhaust fanW, mm815950
Lambda sensorLambdaYes
Fume extraction deviceMYes
Cleaning systemSYes
Eyepiece for viewing the combustion processPYes



For product measurements, they should be read as follows:

Cold water inletA, mmR1¼ "/ 450
Y, mmmG½ "/ 232

A is shown in the previous diagram. "R1¼" and "G½" are the measure in inches of the opening. "R" is male and "G" is female. The measurements in inches indicate the distance between the floor and the opening.






Recommended distances between the boiler and the walls

Burnit PyroBurn Lambda






Relation between wood heating value and water content

Burnit PyroBurn Lambda







Connecting the boiler to a chimney

Burnit PyroBurn Lambda





Connection of the controller with power supply and peripheral equipment

Burnit PyroBurn Lambda





Connecting the safety heat exchanger

Burnit PyroBurn Lambda

1. Water supply network (pressure 6-10 bar)
2. Drainage (sewerage)
3. Boiler WBS Active
4. Safety heat exchanger inlet
5. BVTS valve sensor
6. Safety heat exchanger outlet








Connection of PyroBurn Lambda boiler to P type buffer tank and three-way valve

Burnit PyroBurn Lambda






Connection of PyroBurn Lambda boiler to solar tank SN, buffer tank P and three-way valve


Burnit PyroBurn Lambda






Connection of PyroBurn Lambda boiler to combi tank KSC2 and three-way valve.

Burnit PyroBurn Lambda



Data sheets and documentation