For dry fuels with a water content of up to 35 percent
The USF-S series differs from the USF-W series by the underfed wood fuelled installations, which are predestined for outputs of 250 to 1,000 kW. Important features are:
- 4-sided ventilation of underfeed burning chamber
- Radiant curved structure made of individual stone segments and variable flame passage
- Heat exchanger with large water capacity
- As an option, an automatic ignition system is available as well as automatic heat exchanger cleaning.