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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 70 reviewers.
Rated 5 out of 5 by pleased with my purchase I am very pleased with the furnace I purchased. I like the idea of not having to light a pilot light as my old furnace would need to have the pilot light lit every time the wind blew. I am also very pleased with the quietness of the furnace. October 18, 2014
Rated 4 out of 5 by Seems good I just got the furnace a month ago, but it seems like a good unit. I am comparing this furnace to a 40 year old one, but so far, so good. It's a standard, no bells or whistles furnace but it should get the job done for awhile which is what my family needs. October 16, 2014
Rated 4 out of 5 by New and working well Replaced our original 30+-year-old product with this Lennox equipment. Working very well now after our little 1st stretch of cold weather. Heats up our 3-level, smallish condo quickly so it's not on very often! October 15, 2014
Rated 5 out of 5 by Excellent craftsmanship. I have not had to use this yet. But when they tested it on a hot day in my condominium, I could immediatley feel it and I was amazed at how much heat it was putting out. October 5, 2014
Rated 5 out of 5 by Lennox ML180UH- Love the whisper quiet of this product and it seems to heat the house so much faster than my previous furnace, I hope to get many years of service from this splendid product October 1, 2014
Rated 5 out of 5 by This produce suits our needs! Lennox has been around for a long time. The reputation the company has, made me comfortable buying a Lennox furnace. September 26, 2014
Rated 4 out of 5 by Quality Furnace Recently had this furnace (ML180) installed, and am happy with my choice. The only reason i didnt rate it a full five stars is because i havent gone through a winter yet with it, so it hasent been fully tested. The furnace operates much more quiet then the 22yr old furnace that it replaced. I do not experiance the noise issues that others have complained about. I did alot of research before purchasing and chose this model over the high efficiency modles because it is more affordable and was a good match for my 1500 sq foot ranch. September 16, 2014
Rated 5 out of 5 by This product is the real deal! It is a wonderful furnace. I like all the features so far. I got it before the winter and cold weather, so I have yet to see how it will perform when put to the test, but I'm confident I will outperform any heater I've ever had. It is solid and well-built. Everyone I talk to says Lennox products have great quality. September 13, 2014

Recognitions and Certifications

AHRI Certified Good Housekeeping CSA Design Certified DualFuel

© 2014 Lennox International Inc.