PRODUCT GUIDE Biomass Boilers Cut-away drawing of a Froling P4 pellet boiler Photo: Froling Behind the recommendations Related articles Behind the recommendations Related articles Biomass Boilers Biomass boilers with steady-state or combustion efficiency of 80%, or multi-fuel units with 85%+ efficiency when using gas or oil More about Biomass Boilers Campaign Calls Wood Pellets 'Environmental Disaster' Froling P4: A High-End, High-Performance Pellet Boiler Have Your Wood or Pellet Stove and Cleaner Air Too Pellet Stoves: Wood Burning That's Better for the Environment Biomass vs. Biomass – Round 1 – Scrutinizing Biomass Electricity Generation Biobased Materials: Not Always Greener We tend to think of biobased materials as inherently greener—but even “natural” and “rapidly renewable” materials can carry big environmental impacts.