80% AFUE GMH8/GDH8

  • Up to 80% AFUE performance
  • Multi-speed, multi-position installation
  • Outstanding warranty protection
GMH8/GDH8 Gas Furnace
10 Yr Unit Replacement Limited Warranty* Lifetime Heat Exchanger Limited Warranty* 10 Yr Parts Limited Warranty*

* Complete warranty details available from your local dealer/contractor or at franklinhvacsystems.com. To receive the Lifetime Heat Exchanger Limited Warranty (good for as long as you own your home), 10-Year Unit Replacement Limited Warranty and 10-Year Parts Limited Warranty, online registration must be completed within 60 days of installation. Online registration is not required in Florida, California or Quebec. The duration of warranty coverage in Texas and Florida differs in some cases. Other limitations and exclusions apply; refer to complete warranty details for a full list of limitations and exclusions.

Product Features+

  • Aluminized-steel dual-diameter tubular heat exchanger
  • Energy-saving, quiet four- speed circulator motor
  • Durable 110-volt silicon nitride igniter
  • Electronic control board with self- diagnostics and provisions for electronic air cleaner and humidifier

Outstanding Limited Warranty Protection+

The heat exchanger in the furnace is covered by a Lifetime Limited Warranty for the original, registered homeowner and if it fails during the first 10 years of ownership, we will replace the entire unit. This furnace also has a 10-Year Parts Limited Warranty on all other functional parts. For a full description of all warranties applicable to this product, please review the consumer brochure or product warranty by clicking on the tabs below.


Unlike conventional, single-stage furnace technology, Franklin technology helps eliminate the temperature swings resulting from abrupt, high-stage stops and starts of the furnace by operating at a low heating state the majority of the time. This gas furnace has an AFUE rating of 80%, which means that 80 cents of every $1.00 of heating energy expense warms your home.

Energy Consumption

Before purchasing this appliance, read important information about its estimated annual energy consumption, yearly operating cost, or energy efficiency rating that is available from your retailer.