Solid fuel boiler 450kW (biomass) BURNiT WBS AC Magna



Steel solid fuel boilers satisfy the heating demands of large sized spaces as public and industrial buildings (450kW). Direct connection to closed or open loop heating system. Ready for fitting with pellet burner.

Made in Europe

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Boiler WBS AC Magna

WBS AC Magna s equipped with intelligent controller and two fans with safety flaps to manage the incoming air.

Owing to its smart design WBS AC Magna is easy to transport and install in spite of its dimensions. The device is available in 450kW.

Tested and approved according to EN 303-5.

Boiler warranty : 2 years

Product Features


  • Electronic control unit controls the combustion by modulating the fan speed. Optional control of circulation pumps for central heating and domestic hot water (DHW).
  • Maximum operating pressure of 4 bar.
  • Capable to feed a large-scale heating system.
  • Combustion chamber with large heat exchanging surface and low chamber resistance.
  • The combustion chamber features three-pass flue-gas flow. The mantle fully covers the flue exhaust tubes for optimal heat transfer.
  • Large firebox door ensures easy loading even with bigger logs (up to 1.5 meter long).
  • Convenient inspection door in the upper part of the boiler ensures easy cleaning of the flue exhaust tubes.
  • Eyepiece for viewing the combustion process.
  • Demountable housing;
  • Opening on the loading door for fitting of pellet burner

Safety devices


  • Pressure relief valve 4 bar not incl. in the set;
  • Connection to a safety line in case of overheating
  • STB thermostat;
  • Valves fitted on both fans.
  • Chimney draught flap;

Boiler elements WBS AC Magna
1. Hot water outlet       
2. Safety line
3. Housing   
4. High efficiency thermal insulation
5. Fume exhaust tubes
6. Water mantle (jacket)
7. Three-pass flue gas flow
8. Combustion chamber
9. Metal grate
10. Transportation openings   
11. Door for ash removal
12.Opening on the loading door for fitting of pellet burner
13. Loading door
14. Inspection door
15. Flue
16. Cold water inlet
17. Air-feed fans
18. Drain

Technical characteristics

Elements of boiler WBS AC Magna


WBS Magna Active
Nominal heat outputkW450
Height Hmm2590
Width L / Depth Dmm1140 x 2600
Water mantle volumeL1700
Combustion chamber volumeL1000
Required chimney draughtPa/mbar50/0.50
Insulation boilerHigh-efficiency thermal wool
Insulation doorsHigh-efficiency thermal wool
Recommended fuelWood, humidity 20%, wood briquettes, wood + coals, wood + fruit pits /  boken nuts
Max. length of firewood logsm1.5
Burning time partial / full loadh5.5 / 3.5
Exhaust gas temperature (operation mode)°C150-180
Operating temperature range°C65-85
Température min. du retour d'eau°C60
Operating pressurebar4
Cold water inletA, mmDN 125/500
Hot water outletB,mmDN 125/1700
Safety lineK1, mmDN 50/800
K2, mmDN 50/1700
FlueF, ø / mmø450 / 2170
J, mm570
Flue cleaning opening01,mm1850
02, mm1850
Chimney draught flapGYes
Loading doorN, mm650 x 700
Inspection doorP, mm1100 x 1000
Door for ash removalR, mm890 x 260
Air feed fanW1, mm1450
W2, mm1450
DrainY1, mmG1"/150
Y2, mmG1"/150
Eyepiece for viewing the combustion processVYes
Burner flange (option)ZYes
Electric control box with controllerUYes


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 clearances between the boiler and walls

Burnit WBS Active Magna


Relation between wood heating value and water content

Burnit WBS Active Magna

Overall dimension of boiler body and housing, model WBS-A 450 Magna

Burnit WBS Active Magna

A : 1190mm
B : 2820mm
C : 175mm
D : 2830mm
Weight : 3100kg

Connecting the boiler to the mains power supply

Burnit WBS Active Magna

Connection of BURNiT WBS-A Magna boiler in a closed system

Burnit WBS Active Magna

1 - Thermostat
2 - Expansion vessel
3 - Safety valve
4 - Circulation pump
5 - Cold water collector
6 - Hot water collector
7 - Heating circuit 2 pump
8 - Return valve
9 - Heating circuit 1 pump
10 - Mixer valve
11 - Air vent

Connection of BURNiT WBS-A Magna boiler in an open system

Burnit WBS Active Magna

1 - Cold water inlet
2 - Drainage
3 - Air vent line
4 - Expansion vessel (open)
5 - Return valve
6 - Insulation
7 - Hot water outlet

Data sheets and documentation