Preferred Series BW9 Boiler (Best)

Energy Efficiency

Quiet Level

Durability

- 90 AFUE
- Gas-fired
- Integrated boiler control
- Cast-aluminum heat exchanger
- Optional PVC pipe installation
- 5-year parts limited warranty and a 15-year parts limited warranty
Preferred Series BW3 Boiler (Better)

Energy Efficiency

Quiet Level

Durability

- 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
Legacy Line BW/BS Boiler (Good)

Energy Efficiency

Quiet Level

Durability

- 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 warranty






