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.
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.
"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.
"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.
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.
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!!!!
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 hvac-talk.com shared a statement from Lennox in 2011 that the company would no longer be producing replacement parts for the Pulse units.
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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