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Lennox Pulse Furnace

3.1 of 5 stars 10 reviews | #9 of 26 Furnaces
Updated: Jan 2, 2017 | Read more about Lennox Furnaces | Pulse Warranty

Overview of Pulse

The Lennox Pulse is a discontinued gas furnace with an AFUE of up to 95.5%. The unit had an automotive-type spark plug ignitor used on the initial cycle only, which helped save energy, and worked on the pulse principle, meaning it did not require a pilot burner, main burners, conventional flue or chimney. It could be vented through a side wall or room and was designed to be installed in a utility room, closet, crawl space or attic. The unit's heat exchanger was constructed of cast iron for greater heat transfer, and the heavy-gauge steel cabinet featured a layer of thick fiberglass insulation over the heat exchanger section for increased efficiency and reduced operating sound.

In the mid-1990's there was a large recall of Pulse furnaces due to serious leaks in the heat exchangers.

Consumer Reviews of the Pulse

  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
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1 of 5 stars Rochester, NY
Date created: 2017-01-02

Great Furnace

I purchased this furnace in 1984. I have had a couple of services calls over the years - nothing major. I will probably replace the unit in the next year as my service man says replacement parts are almost impossible to find. My house in Rochester, New York is 1800 square feet. Gas bills in the winter average maybe $80 per month. I would buy another if I could.

1 of 5 stars Sylvania, OH
Date created: 2016-07-29

Lennox Pulse great for me

I have had a Lennox Pulse in my house for 20 years. I have never had a major problem. They did the recall repair about 9 years ago. My house is 2700 square feet and I live in northern Ohio, where below 0 temperatures in January are common. I have never had a bill of over $125 and I pay by the month. Last year my gas bill averaged $61 a month. I don't think anyone or any company could beat this furnace over a 20 year span.

5 of 5 stars Wichita KS
Date created: 2013-07-08

Lennox Pulse - High Efficiency and Noisy

My 1964 house of 3100 sq ft main floor has a 1987 Vintage Lennox Pulse g1404/5-100-6 (100,000 btu in) furnace. This had astonishing 95% efficiency (for 1982 when first sold). Saved heaps of money in gas bill for 25 years. It has worked well so far with basic maintenance. However, it is LOUD as name suggests 'PULSE' like a WWII V1 buzz bomb technology. It uses two spark plugs to ignite the natural gas.

5 of 5 stars
Date created: 2010-05-20


We bought our home when it was 3 years old. It had a Lennox Pulse Furnace (Propane). We are replacing it now with a new 95% eff. Lennox not because of any problems but because it is almost 20 years old and we are getting ready to retire. Also we can use the tax credit. We found our Lennox to be extremely reliable so we are sticking with another Lennox furnace, as well as air conditioner.

1 of 5 stars
Date created: 2010-03-31


In 1989, we purchased a Lennox pulse furnace. Due to a recall in 1998 for a faulty heat exchanger, they replaced the furnace with a new one. This March, we had to replace an inducer motor because the bearings were bad. That cost us over $500. We just replaced our air conditioner and found out now our heat exchanger in our Lennox furnace needs replacing. Even though this exchanger has a lifetime warranty and the parts are free, I had an estimate just for labor was almost a $1000. How can they make such a faulty part! We are talking about possible carbon monoxide here. I will never own another Lennox furnace. Two thumbs down!!!!

5 of 5 stars
Date created: 2009-12-07

20 years and going on the pulse

Purchased this unit in 1989 and had it inspected in 2009. The HVAC guy said the furnace and air conditioner were fine. I've never had a problem with the pulse furnace.

5 of 5 stars
Date created: 2009-08-05

Own a pulse????

If you own a Lennox Pulse furnace you need to call a Sevice Experts company, "a Lennox owned co." They have the pressure test kit for the heat exchanger and if its cracked, there are factory rebates on that furnace. Unfortunatly, Lennox was replacing the pulse with a new g51 furnace but I believe they are now only giving 500.00 to 750.00 dollar credit towards a new furnace. As a tech in this feild I rarley ever see a lennox. As for, Carrier, goodman, trane, janitrol, York, they are all the reason I have a great job... thanks....... -NATE TECH

4 of 5 stars
Date created: 2009-04-02

Lennox Pulse Furnace

The furnace was installed in the house in Mar. 1987 so is now 22 years old! It is a Lennox Pulse unit model b1 403 80 c5. We have had regular inspections and a Lennox heat exchanger check done over the period. No major problems found - minor repair costs. Same unit fitted in neighbours home (same age) failed? In Feb 2009 - condenser leaking excess water - failed by inspecting technician and replaced by new g61v unit - 90k Btu'S. Looking to replace my unit with similar g61v or even the g71v unit. Some of the reviews seen on newer Lennox furnaces are worrying though. I am being told that the installing engineer is as important as the unit that you buy!!

1 of 5 stars Winnipeg, MB
Date created: 2008-11-25


Bought our home 4 years old, as a single mother, in my eyes since the furnace worked, great. Unaware to the forthcoming problems, found out this unit is a Lennox Pulse. Had I known then, I would've offered 10 grand less on the purchase price of my home. I have had nothing but problems with this unit. Works great at 0 - minus 10, but any colder than that, it doesn't come on. Now married, either my husband or I are getting up several times during the night to 'hopefully' reset the dam thing. Also have found out that Lennox had a huge law suit on this brand, which apparently has been settled. We have sunk about 1500.00 into this useless piece of metal, and are glad to say (4 winters later), we are finally in a position to get rid of it, and are purchasing a carrier. Had we known how much money & grief this Lennox Lemon would have caused us, we would've opted out and purchased a different brand of furnace earlier. do not buy a LENNOX....unless, you want to play russian roulette with your Canadian Winters and hope your furnace will kick on.

3 of 5 stars
Date created: 2008-01-23

Bought a house last year with a 16 yr old Lennox Pulse furnace in it. Now the ignition module is wearing out, so looking at replacing it with a new Lennox model - G61V. Hoping that the new one is quieter, as the Pulse`s muffler-style venting makes it feel like you are in an airplane rather than a house when the furnace is on.

Other Pulse Reviews

There are many comments on HVAC forums regarding the recall of the Pulse furnace due to leaks and cracks in the heat exchanger and secondary heat exchanger. A professional on shared a statement from Lennox in 2011 that the company would no longer be producing replacement parts for the Pulse units.

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Pulse Warranty

The warranty for the Lennox Pulse furnace was comprised of the following:

  • Limited lifetime warranty on the heat exchanger
  • 1-year limited warranty on parts

Labor costs were not covered by the warranty.

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