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GWM-IE Boiler

GWM-IE Boiler

High-efficiency, gas-modulating condensing water 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® qualified which means it meets or exceeds U.S. federal guidelines for energy efficiency.

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.


Features and Benefits

Energy Efficiency

  • ENERGY STAR® qualified—meets or exceeds EPA guidelines for energy efficiency, which means energy savings
  • Electronic ignition control—monitors water temperature and maximizes efficiency by turning on the burner only when needed
  • Stainless steel, finned-tube heat exchanger design—converts waste energy into usable heat

Quiet Operation

  • Sealed combustion—minimizes fan noise and provides quiet, soothing heat

Home Comfort

  • Modulating capability—allows burner to fire at a rate as low as 20% of its full capacity to perfectly match your comfort needs

Reliable Performance

  • Stainless steel, finned-tube heat exchanger design—is self-cleaning and extremely durable
  • Stainless steel mesh burner—provides greater resistance to corrosion and oxidation than aluminized steel burners
  • CPVC flue condensate collector—is corrosion resistant and eliminates the use of metal in venting area

Warranty and Specs

Warranty and Specs

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

GWM-IE Product Literature

Product Brochures


GWM-IE Boiler Product Brochure

Installation Manuals


GWM-IE Boiler Installation Manual


Recognitions and Certifications

EnergyStar ASME AHRI Certified C CSA Approved (US) CSA Design Certified

© 2015 Lennox International Inc.