Performance 84 Boiler The ideal heat source for traditional radiant heat systems   Gas-fired hot water boiler. Energy efficient — AFUE of up to 84.4%. Stainless steel/titanium alloy composite burners for quiet operation and improved efficiency. Fiberglass insulated casing provides maximum economy. Small, compact design. 20-year heat exchanger limited warranty. Five-year parts limited warranty.   Benefits - Carrier's Performance™ Series boilers are the ideal heat source for traditional radiant heat systems. Download Brochure Features - Integrated boiler control provides responsive heating and reliable operations.   Specifications