*Up to 84.4 AFUE

*Cast iron heat exchanger

*Gas-fired models

*Stainless steel/titanium alloy composite burners

*Fiberglass insulated casing

*20-year heat exchanger limited warranty

*5 year parts limited warranty

*Up to 81.6% AFUE

*Gas-fired, Water, or Steam models

*Standard standing pilot or optional electronic ignition

*Electric vent damper

*Stainless steel/titanium alloy composite burners

*12-year heat exchanger limited warranty

*5 year parts limited warranty

*Efficiency rating up to 86% AFUE

*Tankless Heater Option

*Electronic Low Water Cut Off available

*Top Flue outlet and cleaning access

*Energy Star® qualified

*25 year heat exchanger limited warranty

*1 year limited parts warranty