With a 95% AFUE rating,^* The GVM-IE boiler is ENERGY STAR^® qualified and up to 40% more efficient than conventional boilers. It features an electronic ignition control, which coordinates power to the burner to your household’s consumption to help ensure it maximizes your fuel savings while keeping your home comfortable.

• Strong, self-cleaning, stainless steel heat exchanger converts unused energy into usable heat
• Sealed combustion keeps operating noise at a minimum
• Modulating power perfectly meets your comfort needs by allowing the burner to fire at as low as 20% of its capacity
• Stainless steel mesh burner resists corrosion and oxidation
• CPVC flue condensate collector is corrosion-resistant and eliminates the use of metal in the venting area
• 15-year limited warranty on heat exchanger, 10-year limited warranty on remaining covered components

Simple to integrate with an existing, traditional radiator system, the GWB9-IH boiler is ENERGY STAR qualified. Even better, it boasts an AFUE rating of 90%.^* It also transfers heat potentially three times faster than a conventional cast-iron exchanger, thanks to its cast-aluminum heat exchanger.

• Enduring, heavy-gauge steel cabinet with baked-on paint finish
• [Compact|Condensed|Small]38] design for different installation options
• Sealed combustion keeps operating noise at a minimum
• Electronic ignition controls water temperature and turns on the burner only when needed
• Burns natural gas or can convert to LP gas
• 15-year limited warranty on heat exchanger, 10-year limited warranty on remaining covered components

So much more efficient than an older boiler, the GWB8-IE boiler carries an 84.4% efficiency rating.* What makes it even better is that it can work with traditional radiator systems.

• Electronic ignition controls water temperature and turns on the burner only when needed
• Thick fiberglass insulation greatly reduces off-cycle heat and energy loss
• Cast-iron heat exchanger and titanium burners constructed for years of durability
• Available in six different sizes for ultimate installation flexibility
• Burns natural gas or can convert to LP gas
• 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts

This standard-efficiency boiler will last for years to come because it’s built from quality materials, including a long-lasting cast-iron heat exchanger and durable stainless steel burners.

• Electronic ignition monitors water temperature and lights the burner only when needed
• Thick fiberglass insulation minimizes off-cycle heat and energy loss
• Will work with traditional radiator systems
• Offered in nine different sizes for installation anywhere in your home
• Burns natural gas or can be converted to LP gas
• 20-year limited warranty on heat exchanger, 1-year limited warranty on remaining covered parts