The Peerless® PUREFIRE® gas-fired condensing boiler is a high-efficiency boiler for residential applications and is available for either natural or LP gas. The direct vent, sealed combustion boiler has an ultra-high 95% efficiency and is ENERGY STAR®approved! The PUREFIRE®, available in six residential sizes has ASME and ETL certifications for both the U.S. and Canada and isthe 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.