Preferred Series BW3 Boiler (Best)

• Up to 84.4 AFUE
• Cast iron heat exchanger
• Gas-fired models
• Stainless steel/titanium alloy composite burners
• Fiberglass insulated casing
• Small, compact design
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section

Legacy Line BW/BS Boiler (Better)

• Up to 81.6 AFUE
• Cast iron heat exchanger
• Gas-fired models
• Water or steam models
• Standard standing pilot or optional electronic ignition
• Electric vent damper
• Stainless steel/titanium alloy composite burners
• Compact design
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW1A)
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW2A)
• 5-year parts limited warranty and a 12-year parts limited wa...rranty on heat exchanger section (BS1A)
• 5-year parts limited warranty and a 12-year parts limited wa...rranty on heat exchanger section (BS2A)