Peerless Boilers’ PureFire gas-fired condensing boiler series is a high-efficiency, 95% AFUE boiler available for either natural or LP gas systems. The direct-vent, sealed-combustion boiler features a fully modulating, stainless-steel burner and is environmentally friendly with low-NOx operation. The boiler is available in six residential sizes — all Energy Star-rated; six commercial sizes are also available.