Comfort 80 Water Boiler The ideal heat source for traditional radiant heat systems   Gas-fired hot water boiler. Energy efficient — AFUE of up to 81.6%. Standard standing pilot or optional electronic ignition. Stainless steel/titanium alloy composite burners for quiet operation and improved efficiency. Fiberglass insulated casing provides maximum economy. 20-year heat exchanger limited warranty. Five-year parts limited warranty.   Benefits - Carrier's Comfort™ 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