PF-110 - 89,000 BTU Output PUREFIRE High Efficiency Residential Boiler (Nat Gas). The Peerless PUREFIRE gas-fired condensing boiler is a high-efficiency boiler for residential (PF-50, PF-80, PF-110, PF-140, PF-210) and commercial applications (PF-399). The direct vent, sealed combustion boiler is ENERGY STAR approved and has ASME and ETL certifications for both the U.S. and Canada. PUREFIRE is the most thoroughly tested high efficiency boiler on the market! A unique condensate system with built-in neutralizer component and float switch protection is a top feature of the boiler.