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ML180 Gas Furnace

Merit® Series

ML180 Gas Furnace

Economical, standard-efficiency gas heating

Enjoy the exceptional comfort that comes with reliable Lennox® engineering. The ML180's durable, high-quality design ensures long-lasting performance. And with an efficiency rating of 80% can save you in energy costs, especially compared to an older furnace.


Here are some of the top features of the ML180:

Efficiency rating of 80% AFUE can save you hundreds of dollars each year compared to older furnaces.

Sealed blower compartment minimizes losses and maximizes efficiency and comfort.


Features and Benefits

Energy Efficiency

  • Efficiency rating of 80% AFUE—can save you hundreds of dollars each year, compared to older furnaces
  • Dual-fuel capability—can be combined with an electric heat pump to enhance comfort and fuel efficiency by alternating between electric and gas heat, optimizing energy use and minimizing heating costs

Reliable Performance

  • Duralok Plus™ heat exchanger—made of high-quality, patented ArmourTuf aluminized steel
  • Hot surface igniter—controls furnace operation to ensure reliable, efficient performance

Warranty and Specs

Warranty and Specs

  • 20-Year Limited Warranty on heat exchanger
  • 5-Year Limited Warranty on covered components
  • This product may be eligible for valuable 10-Year Limited Extended Warranty coverage.

ML180 Product Literature

Product Brochures


ML180 Gas Furnace Product Brochure

Installation Manuals


ML180UH Gas Furnace Installation Manual

Homeowners Manuals


ML180 Gas Furnace Homeowners Manual
ML180UH Gas Furnace Homeowners Manual


Rated 4.3 out of 5 by 60 reviewers.
Rated 3 out of 5 by Basic Furnace Installed in summer so haven't had chance to try heating. Unit is much smaller than unit it replaced which is nice. August 11, 2014
Rated 5 out of 5 by This product is very reputable We had the heater and air conditioner installed at the same time, but it is summer and we have not had a chance to test the heater. Our previous unit was a Lennox and it was the original unit that was put in the house in 1952. It was still working well in 2014. July 8, 2014
Rated 5 out of 5 by Great Quality Product It is not winter yet but I did test my new unit to see the effectiveness of heating my home and it passed with flying colors. July 6, 2014
Rated 5 out of 5 by Great customer service...Returned after installing Unit Great customer service...I never had to clean up after they left...You don't see that much any more, most leave a mess behind, Thank you for great service...& as always, Thanks to Lennox Products...I am A Happy Lennox Customer!!!!! July 2, 2014
Rated 1 out of 5 by This product does not push enough heat. I am very disappointed in my new furance. It does not heat the house properly. Blows pea warm air not hot. Run's way more than my old furnace ever did. I'm am now affraid of what my gas bill will be. We also had a new air conditioner put in I hope it cool 's the house and doesn't run like the furance. Not a happy consumer! March 31, 2014
Rated 5 out of 5 by 3 years and no problems Had the furnace and AC upgraded when we moved into this house. The previous one looked like it was made in the 1950's, so needles to say this Lennox was a great improvement. 3 years on it still runs like new. March 28, 2014
Rated 2 out of 5 by Below average furnace The furnace keeps home warm--but it is the noise that makes me sorry I purchased it. I can hear the burner and fan noise at a level that is disturbing. I am surprised your company would produce a furnace this noisy. I believe I will have to replace it and take a big loss. February 27, 2014

Recognitions and Certifications

AHRI Certified Good Housekeeping CSA Design Certified DualFuel

© 2014 Lennox International Inc.