Preferred Series BW9 Boiler Model: BW9A Key Features Up to 90% AFUE Gas-fired Integrated boiler control Cast-aluminum heat exchanger Optional PVC pipe installation 15-year heat exchanger limited warranty 5-year parts limited warranty Click here to read more. Preferred Series BW3 Boiler Model: BW3A Key Features Up to 84.4% AFUE Cast iron heat exchanger Gas- or oil-fired models Stainless steel/titanium alloy composite burners Fiberglass insulated casing Small, compact design 20-year heat exchanger limited warranty 5-year parts limited warranty Click here to read more. Legacy Line BW/BS Boiler Model: BW1A Key Features Up to 81.6% AFUE Cast iron heat exchanger Gas- or oil-fired models Water or steam models Standard standing pilot or optional electronic ignition Electric vent damper Stainless steel/titanium alloy composite burners Compact design 12-year heat exchanger limited warranty 5-year parts limited warranty Click here to read more.

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