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Boiler for pellets and wood DEFRO Firewood Duo
FIREWOOD DUO – Wood and Pellet Boiler
- APC K SLIM ADAPTIVE CONTROL controller managing 4 pumps and 1 mixing valve
- Remote monitoring and parameter adjustment via optional internet module
- Pellet burner with standard automatic cleaning
- Automatic ignition system
- High-grade certified steel heat exchanger
- Weather-compensated control as standard
- Compact dimensions
- Fuel hopper can be repositioned on any side
This modern unit is designed for efficient combustion of both split firewood and wood pellets in accordance with PN-EN 303-5:2021‑09.
The FIREWOOD DUO boiler comes equipped with an automatic cleaning pellet burner and the APC K SLIM controller, which supports four pumps and one mixing valve. A major advantage is its flexible fuel hopper, which can be installed on any side, making it ideal for tight boiler rooms.
FIREWOOD DUO qualifies for subsidies under the Czyste Powietrze (“Clean Air”) programme as a wood gasification boiler.
Controller Features
- Innovative ADAPTIVE Control with turbine flow meter – optimises fan and feed rates
- Fan control – monitors airflow for proper combustion
- Fuel feed control
- Management of CO, DHW pumps and two additional pumps
- Control of one mixing valve
- Automatic ignition and shutdown
- Weekly scheduling
- Weather-compensated control
- Optional internet-based remote control
- Supports room thermostat via RS or traditional communication
- Option to connect ST‑65 GSM module
- Ignition assisted by electric heater
- Extra mixing valve control via DERFO I‑1/I‑1M module
- Large color graphic display
- Sensors for boiler, DHW, return, two auxiliary pumps, valve and flue gas temperatures
- Photocell flame sensor
- STB temperature safety protection
- Burner thermal protection
Standard Equipment
- APC K Slim controller
- ADAPTIVE CONTROL
- Leveling feet
- Igniter
- Weather-compensated control
Optional Extras (with surcharge)
- GSM module
- Module I‑1
- Module I‑1M
- Internet module – LAN
- Internet module – WiFi
- Room thermostat ST‑292 v3
- Room thermostat ST‑292 v2
- Room thermostat DEFRO SPK Lux
- Wireless SPK Lux thermostat
- RS wireless communication kit
Technical Data – Boiler Power
| Parameter | Unit | 12 kW | 15 kW | 19 kW | 24 kW |
|---|---|---|---|---|---|
| Fuel | – | Wood pellets Ø 6 mm | |||
| ZUM ID | – | KZ‑600507 | KZ‑800506 | KZ‑000505 | KZ‑300504 |
| Power range | kW | 3.5–12.2 | 4.2–15.2 | 5.3–19.3 | 7.1–24.2 |
| Fuel hopper capacity¹ | kg | ~180 | ~180 | ~180 | ~180 |
| Nominal efficiency | % | 91.9 | 92.1 | 92.4 | 92.0 |
| Minimum-load efficiency | % | 92.9 | 93.0 | 92.9 | 92.8 |
| Energy efficiency class | – | A+ | |||
| Max. working pressure | bar | 1.5 | |||
| Required flue draft | Pa | 15–25 | 18–25 | 20–21 | 22–24 |
| Max water temp (supply) | °C | 70/80 | |||
| Boiler weight | kg | 383 | 406 | 436 | 501 |
| Water content | l | 71 | 78 | 84 | 99 |
| Supply/return connection | ” | G 1½” | |||
| Flue outlet diameter | mm | 159 | 159 | 159 | 178 |
| Power supply | V/Hz | ~230/50 | |||
Dimensions
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