UNDERFEED PRINCIPLE FOR DRY FUELS - water content up to 35%

USF-S series wood-fuel boilers operate on an underfeed principle and are designed for an output of 100 to 300 kW.


Wood firing for any application

Not only can you fire your own waste wood, even with a high dust content, with wood-fuel boilers from ENDRESS but also chopped wood or pellets. Whether for joineries, saw mills, furniture industry or local authorities - our team manufactures all wood-fuel boilers to a high level of quality at the Burgbernheim plant. Our systems are suitable for any boiler room thanks to their clever design. They are also packed with user friendliness and convenience.

✔ Made in Germany

✔ Industrial standard 

✔ Fuel class 4-7


eat exchanger cleaning

The automatic heat exchanger cleaning saves material and ensures a consistently high level of boiler efficiency and infrequent cleaning intervals. 

Underfeed combustion chamber

The combustion retort is a 15 mm thick steel construction with completely automatic ash removal and a standard ash container for convenient disposal. Self-supporting combustion chamber made from high-temperature ceramic cement. A 2-sided vented underfeed combustion chamber ensures efficient and clean combustion. Durable boiler housing with 10 mm wall thickness.

Grate bars

The grate bars of the underfeed retort are made from high-temperature-resistant cast stainless steel with a chrome content of 27%, guaranteeing a long service life. 

Automatic ignition

In cooperation with a temperature-controlled ignition fan, a well-engineered ignition program makes heating up possible without degenerating the material. 


Screw stoker and ash removal unit are driven by high quality geared motors made in Germany. 

All from a single source

Fuel feeding systems 

All from a single source. We have the perfect, individual solution to feed in your fuel.

Fine dust filter

In-house developed innovative and highly effectively filter technology.

Control systems 

The intelligent Maxi E-Compact Lambdatronic control assures perfect combustion of your fuel.

Still unsure or perhaps you have already found the right firing technology to suit your needs?
Get in touch and let our experts provide you with individual advice according to your wood firing requirements.

Or simply pop in for a visit!
And get to know the system that meets your personal requirements to a tee.