DEFRO CLASSIC hand-loaded boilers are designed with horizontal flue gas channels, suitable for upper combustion of solid fuels. They are intended for heating buildings with an area of up to 250 square meters. Primary fuel: anthracite coal in nut size. Alternative fuels: a mixture of anthracite coal in nut size and fine size, seasoned wood, and wood waste. The combustion process, using natural air draft, does not require electric power. These boilers operate with the aid of natural air draft, and temperature is mechanically regulated using a knob for the damper in the ashpan door or with a draft regulator (additional equipment).
3 The boiler width is provided with a draft regulator. The draft regulator is not included as part of the boiler’s equipment.
Boiler name | DEFRO Classic | |||||
Boiler specification/type | IU | 6 | 10 | 15 | 20 | 25 |
Power range | kW | 1,8-6 | 3,0-10 | 4,5-15 | 6,0-20 | 7,5-25 |
Heating surface | m2 | 0,9 | 1,6 | 1,7 | 2,0 | 2,3 |
Area of heated rooms 1 | m2 | Up to 100 | Up to 140 | Up to 170 | Up to 220 | Up to 250 |
Single fuel load. | kg | ~18 | ~21 | ~21 | ~30 | ~41 |
Optimum thermal efficiency | % | ~81,3-83,9 | ||||
Energy efficiency class | – | D | D | D | D | D |
Max. permissible pressure
working |
bar | 1,5 | ||||
Required exhaust gas draft | Pa | 18 | 20 | 22 | 23 | 26 |
Supply water temperature max. | °C | 65/90 | ||||
Boiler weight 2 | kg | 161 | 236 | 240 | 273 | 305 |
Boiler water capacity | l | 33 | 52 | 55 | 62 | 73 |
Cross-section of the chimney | cmxcm | 14×14 | 14×14 | 14×14 | 14×14 | 16×16 |
Cross-section of the chimney | O mm | 160 | 160 | 160 | 160 | 160 |
Minimum height of the chimney | m | 5,5 | 5,5 | 6 | 7 | 7 |
Width | mm | 462 | 550 | 550 | 600 | 600 |
Depth | mm | 765 | 930 | 930 | 940 | 1010 |
Height | mm | 1050 | 1260 | 1260 | 1310 | 1365 |
Supply and return diameter Dn | mm | G1 1” | ||||
Flue diameter | mm | 127 | 159 | 159 | 178 | 178 |
Hopper chamber dimensions. | width
depth height width x height |
258
253 250 258 x 188 |
258
368 264 258 x 188 |
258
368 264 258 x 188 |
308
368 315 308 x 328 |
308
438 354 308 x 238 |
Height to the lower edge of the firebox door. | mm | 795 | 965 | 965 | 1015 | 1065 |
1 The maximum heated area estimated for individual heat demand of q=80 W/m².
2 The weight of the boiler depends on the equipment
3 The boiler width is provided with a draft regulator. The draft regulator is not included as part of the boiler’s equipment.