Preferred Series BW4/5 Boiler (Best)

• Oil fuel
• Up to 86 AFUE
• Sectional cast-iron design
• Cast-iron heat exchanger
• Small compact design
• Swing burner door
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW4B)
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW4R)
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW5B)
• 5-year parts limited warranty and a 20-year parts limited wa...rranty on heat exchanger section (BW5R)

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)