Product Overview & Application Area
The ATTACK SLX 20 PROFI is a manually fed wood gasification boiler for closed hot water heating systems. With a nominal output of 20 kW and an output range of 10 to 20 kW, this version is suitable for central heating systems whose heat demand has been professionally matched to the boiler output.
The 200-liter filling chamber accommodates dry, split firewood with a length of up to 650 mm. The generously sized fuel chamber enables longer burn phases and reduces the effort required for splitting and reloading fuel.
Technology & Equipment
The temperature-controlled PROFI-PID controller processes boiler and flue gas temperatures and adjusts the speed of the induced draft fan to the operating state. In addition to the heating circuit pump, an additional controller output can optionally control a domestic hot water or buffer storage loading pump.
In the PROFI version, primary and secondary air are mechanically preset. A lambda sensor is not part of this control variant. The tubular heat exchanger with turbulators supports heat transfer to the heating water. An integrated safety heat exchanger allows the connection of a thermal drain safety device.
Everyday Benefits
The 200-liter filling chamber and the maximum log length of 650 mm allow the use of longer logs. With suitable fuel quality, nominal operation, and a correctly matched system, the approximate burn duration is up to about eight hours per filling.
The PROFI-PID controller combines monitoring of boiler and flue gas temperatures with modulating fan control. The pump functions can be set according to the planned system hydraulics.
System Integration & Compatibility
For the ATTACK SLX 20 PROFI, a buffer tank volume of 1,500 liters is recommended. The final sizing depends on the heating load, system hydraulics, heat consumption, operating mode, and the technical requirements of the respective building.
The flow and return connections are designed as G 6/4 inch connections. The flue pipe connection has a diameter of 150 mm, and the required chimney draft is 23 Pa. A suitable return temperature boost must ensure a return temperature of at least 65 °C.
Technical data at a glance
| Nominal output |
20 kW |
| Fuel |
Dry, split firewood |
| Combustion technology |
Wood gasification boiler |
| Fuel efficiency at nominal output |
81.8% |
| Seasonal space heating energy efficiency |
79% |
| Energy efficiency class |
A+ |
| Energy efficiency index |
EEI 116 |
| Boiler class |
Class 5 |
| Maximum log length |
650 mm |
| Flue gas temperature at rated load |
165 °C |
| Required chimney draft |
23 Pa |
| Flue pipe connection |
150 mm |
| Flow and return |
G 6/4 inch |
| Safety heat exchanger |
Yes |
| Lambda sensor |
No |
| Maximum operating overpressure |
2.5 bar |
| Recommended buffer tank volume |
1,500 liters |
| Electrical connection |
230 V / 50 Hz / 10 A |
| Auxiliary power at rated output |
45 W |
| Protection class |
IP20 |
| Dimensions H × W × D |
1,472 × 703 × 1,337 mm |
| Weight |
570 kg |
Installation
Installation, hydraulic connection, chimney connection, electrical connection, initial commissioning, and safety inspection must be carried out by appropriately qualified professionals. The system requires an effective return temperature boost, a properly sized buffer tank, a safety valve, a thermal drain safety device, and a permanently secured heat dissipation.
Notes
For proper operation, dry, split firewood with a recommended moisture content of about 12 to 20 % must be used. Wet or unsuitable fuel can impair performance and combustion quality and promote the formation of tar and condensate.
The required boiler output, buffer tank size, system hydraulics and chimney design must be determined on a project-specific basis. The performance data do not replace a heat load calculation or professional planning.
Scope of delivery
- ATTACK SLX 20 PROFI wood gasification boiler with integrated PROFI-PID control