GWM-IE Boiler

Designed to maximize fuel savings, the GWM-IE boiler delivers up to 40% greater efficiency than conventional boilers. Its burner matches heating output to household demand, using only the energy necessary to keep you comfortable.

Here are some of the top features of the GWM-IE:

  • Efficiency rating of up to 95% AFUE.
  • ENERGY STAR® certified which means it meets or exceeds U.S. federal guidelines for energy efficiency.
  • This product has been designated as one of the Most Efficient ENERGY STAR certified products in 2017. Products that are recognized as the Most Efficient of ENERGY STAR in 2017 prevent greenhouse gas emissions by meeting rigorous energy efficiency performance levels set by the U.S. Environmental Protection Agency.
  • Modulating capability allows burner to fire at a rate as low as 20% of its full capacity to perfectly match comfort needs.
  • Electronic ignition control burns fuel only when necessary, reducing energy costs.
  • Stainless steel heat exchanger
  • ENERGY STAR® qualified
  • Sealed-combustion design
  • 15-year limited warranty on heat exchanger, 10-year limited warranty on remaining covered components
  • Publications:


    AHRI Certified C


    CSA Approved (US)

    CSA Design Certified



  • 15-Year Limited Warranty on heat exchanger
  • 10-Year Limited Warranty on covered components