







Firewood – a boiler intended for wood burning, meeting the criteria of Class 5 and Ecodesign. It uses a two-stage combustion technique – gasification of the fuel and subsequent pyrolysis, i.e. combustion of the resulting gases.
Reinforced boiler structure based on the multi-pass structure of flue gas channels.
The horizontal and vertical arrangement of the boiler exchanger guarantees optimal thermal efficiency of 90.7%.
The fireplace is covered with ceramics made of refractory material – ceramic catalysts.
Gravity air supply system to the boiler, divided into: primary and secondary air supply.
Nozzle reducing exhaust emissions (protected by the Polish Patent Office).
Large charging chamber.
Suitable for installation in a closed system, provided that fittings and protections are used to dissipate excess thermal power, in accordance with the boiler documentation.
It is possible to install an additional control set consisting of a controller and an exhaust fan*
Required operation of the boiler with an accumulation tank (so-called buffer)**.
Viewfinder – enabling the suspicion of fuel combustion in the exchanger without opening the door
The standard equipment of the boiler is equipped with a draft regulator and feet that regulate the height of the device
Boiler specification/type | J.m. | 12 | 15 | 19 | 24 |
Fuel | hardwood log – birch Ø12 cm | hardwood log – birch Ø12 cm | hardwood log – birch Ø12 cm | hardwood log – birch Ø12 cm | |
Min. safe tank capacity accumulation |
l | 600 | 800 | 1000 | 1300 |
Chamber capacity hopper |
kg | ~14 | ~20 | ~25 | ~27 |
Thermal efficiency for nominal power | % | 90,6 | 90,5 | 90,6 | 90,7 |
Energy efficiency class | A+ | A+ | A+ | A+ | |
Max. permissible working pressure | bar | 1,5 | 1,5 | 1,5 | 1,5 |
Required exhaust gas draft | Pa | 25 | 25 | 21 | 24 |
Supply water temperature min/max. | °C | 75/90 | 75/90 | 75/90 | 75/90 |
Boiler weight | kg | ~307 | ~331 | ~353 | ~413 |
Boiler water capacity | l | 71 | 78 | 84 | 99 |
Supply/return diameter | cal | 1 ½ ’’ | 1 ½ ’’ | 1 ½ ’’ | 1 ½ ’’ |
Flue diameter | Ø mm | 159 | 159 | 159 | 178 |
Height | mm | 1225 | 1245 | 1245 | 1365 |
Width | mm | 555 | 555 | 605 | 655 |
Depth | mm | 902 | 952 | 952 | 952 |
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If you want to install a new heat source, it is worth paying attention to DEFRO devices, a Polish manufacturer with many years of experience in the heating industry. Our specialists will help you choose the right boiler and its power, and distributors and installers will take care of the assembly and commissioning, and all you need to do is enjoy the warmth and comfort. The distribution network of our products is divided into regions for which managers and salespeople are responsible.