Piston feeder boiler STALMARK Duo Boss 24 kW

Piston feeder boiler STALMARK Duo Boss 24 kW

NN: 25730 / 29912
Available Options

Thanks to the side construction DUO BOSS has got two individual furnaces – side piston feeder and permanent steel water grate. Thanks to the side construction, it is possible to set it even in the smallest boiler rooms. The boiler is equipped with the newest ST-609H steering which can operate up to 4 pumps (central heating, domestic hot water, floor and circulation).

48 months for tightness
24 months for electronic elements
12 months for protection of furnace door

Fuel: hard coal, coal dust, pea coal
The calorific value should be 25MJ/kg
Granulation of fuel: 5-40 mm

Product specification

Power output 24 kW
Exhaust gas pipe diameter 180 mm
Weight 507 kg
Efficiency 86.5 %
Size of heated surface 240 m²
Water capacity 90 L
Boiler heating surface 2.5 m²
Height 1573 mm
Width 1210 mm
Exhaust pipe distance measured from the floor to its base 1460 mm
Depth with exhaust pipe 750 mm
Max. water temperature 90 °C
Max working pressure 1,5 bar
Loading compartment dimensions 350 x 273 mm
Silo volume 255 dm³
Required chimney draught 20-30 Pa
Min. chimney height 6 m
Outlet and inlet size 6/4" inch
Min. incoming water temperature 55 °C


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