BURNiT WBS Active 110, 110kW


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Solid fuel boiler with fan-assisted combustion Burnit WBS Active 110 for central heating of premises up to 650m². Constructed for solid fuel burning - wood, wood briquettes class B and coal.

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Product Description

Steel boiler with intelligent electronic controller and electric fan for forced air feed. Solid fuel boilers WBS Active range in nominal output from 20 to 110 kW to satisfy the heating demands of medium to large sized spaces. They are engineered for burning solid fuel - wood, wood briquettes class B and coal, and provide the option for fitting pellet, oil or gas-fired burners.


The boiler body is manufactured from high quality steel with 5mm thickness for the combustion chamber and 3mm thickness for the water mantle. The combustion chamber has a large heat exchanging surface and low chamber impedance. Large firebox door ensures easy loading even of large chunks of wood.

Controller ST-81

ST–81 temperature regulator is intended for controlling central heating boilers. It controls the water circulation pump, domestic hot water pump and the fan. Four optional modes of the pumps operation: house heating, boiler priority, parallel pumps, summer mode. The controller's casing is designed to be mounted to the boiler installation. Its functions are based on data from sensors. The electronic control unit regulates the burning process with the blower, based on the fuel used and the chimney draught, allowing for a wide range of operation.


To increase the heat exchange, the combustion chamber's surface is ribbed and designed for a three-pass flue gas flow. The mantle completely envelops the firebox for maximized usage of the heat. The boiler's body is insulated from the external conditions by 50mm thick high temperature resisting wool.

Safety devices

For a safe and reliable operation of the boiler, a number of safety devices are installed

- Removable metallic ash grate protects the heat exchanging pipes and the chamber base from the flame

- Pressure relief valve 3 bar incl.in the delivery set

- Safety heat evacuator: a tap-water filled line passes through the uppermost part of the boiler body. In case of overheating it is triggered open by a thermostatic valve (not included) to evacuate the heat off the boiler.


The central heating boiler can operate with natural untreated wood, but also with coal and compressed solid fuel such as briquettes. Maximum length of the wood logs is between 330mm and 500mm depending on the model. Fuel moisture should be 20% or lower.

In order to use the maximum caloricity of the fuel, the wood logs should be dried for a prolonged period of time. High moisture levels reduces caloricity and the output power of the boiler.


This series of boilers is manufactured for burning solid fuel, with the option of adaptation to a different kind of fuel. This is possible by mounting a pellet, gas or an oil burner on the lower door opening. A flange is also needed to mount the burner (optional).

Schematic of the main features of a WBS Active wood boiler




1. Control unit
2. Casing
3. High efficiency thermal insulation
4. Safety heat evacuator
5. Three-pass flue gas flow
6. Mantle
7. Combustion chamber
8. Metal ash grate
9. Ash- and- soot container
10. Burner flange (optional)
11. Flue
12. Air feed fan
13. Air intake flap

This appliance complies with EN 303-5.

Additional Information

1 year electronic components, 2 years on the boiler

Weight (kg)

Country of Manufacture

Product Brand

Heat output (kW)

Approximate heating surface (m²/ft²)

Approximate heating capacity (m³)

Dimension Depth (mm)

Dimension Width (mm)

Dimension Height (mm)

Loading door size (Height, Width), mm
310 / 610

Construction material

Mantle volume (L)

Insulation boiler
high efficiency thermal wool

Insulation doors
high efficiency thermal wool

Combustion chamber volume (L)

Combustion chamber impedance (Pa/mbar)
67/ 0.67

Combustion viewer

Pellet burner

Operating pressure (bar)

Operating temperature range (°C)

Maximum water temperature (°C)

Min. return water temperature (°C)

Recommended fuel
wood, humidity 20%, wood briquettes ; coal

Fuel Type
Wood, Briquettes, Coal

Maximum length of the firewood logs (mm)

Flue (mm)

Required chimney draught (Pa/mbar)
56/ 0.56

Flue cleaning opening
O : 150/70 mm

Exhaust gas temperature (operation mode), °C

Exhaust Location
Back side

Lambda sensor

Flue gas temperature sensor

Control panel
U: Yes

Control unit
ST - 81

Control of central heating pump

Remote control

Electric power supply (V/Hz)
220 / 50

Average power consumption (W)

Combustion forced ventilation

Automatic cleaning system

Thermostatic draught regulator

Temperature indicator


Cold water inlet
A : G 2''/ 135 mm

Hot water outlet
B : G 2''/ 1410 mm

Distance of hot water outlet
J : 425 mm

Height of Hot Water Outlet
B : 1410 mm

Cooling loop

Safety line sleeve
K : G 3/4'' / 1250 mm

Safety heat evacuator inlet/outlet
E : R 1/2'' / 1210 mm

Air fan supply
W : 277mm

Air intake flap
V : 277 mm

Height of Flue Pipe
F: 1055 mm

Height of Water Drain Valve
Y : 125 mm

Y : G 1''

Burner flange (optional)
Z : 215 mm

Ash and soot container
X : Yes

Files & Manuals

View FileTechnical manual for Sunsystem Burnit boiler wbs active _BG_RU_GR_RO    Size: (6.61 MB)
View FileTechnical manual for Sunsystem Burnit boiler wbs active _EN_DE_FR_ES_IT    Size: (7.52 MB)