Lennox G8 Furnace Manual

1. Lennox G8 Furnace Manual Thermostat
2. Lennox G8 Furnace Manual Transfer Switch
3. Lennox G8 Furnace
4. Lennox Diplomat Furnace Manual

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Updated December 13, 2020

November 21, 2019

Lennox is a forward-thinking company that specializes in innovative technologies that maximize efficiency and minimize noise. With 20 different furnace models available and expert representatives, Lennox has consistently earned recognition as a brand of excellence. Read on to learn about the types of Lennox furnaces available, specifics on 10 of their top models, an overview of pricing and warranty options and what to look for in Lennox furnace reviews.

Types of Lennox Furnaces

Most Lennox furnaces run on gas, but some use oil instead. Within those two fuel types, different furnace models offer different features. Different models include variable speed, ultra-low emission, and two-stage furnaces.

Variable speed furnaces prevent large temperature fluctuations and reduce operating costs while providing consistent heating with lower humidity. Ultra-low emission Lennox furnaces burn away more NOx gases and result in cleaner emissions, healthier for you and the environment. Two-stage furnaces offer both high and low output settings that calibrate furnace heat flow to thermostat settings. Furnaces with constant torque motors offer improved efficiency while delivering greater comfort and cost savings.

Lennox Furnace Models

Lennox offers furnace options to fit various budgets, heating requirements, and energy-efficiency preferences. Below are the top 10 Lennox furnace models.

SLP98V

This energy-efficient Lennox furnace is the company's flagship gas furnace and has an industry-leading AFUE rating of 98.7 percent. This heating system was named one of the most efficient Energy Star-certified products of 2019.

This quiet unit has two heat exchangers and condensing technology, which provides effective heat dispersement. The modulating valve and a variable-speed blower improve performance, and according to Lennox, the unit's silicone nitride ignitor increases its durability and reliability. The system runs on natural gas and is compatible with the Lennox smart thermostat.

SL280V

This popular furnace has an AFUE rating of 80 percent. With two-stage heating and a variable-speed motor, this model provides efficient heating. The system uses Lennox's proprietary SilentComfort technology, and sound-absorbing insulation further quietens operation. This natural-gas heating system is compatible with Lennox's smart thermostat for automatic temperature control and remote access.

EL296E

This Lennox furnace has an AFUE rating of 96 percent, which means it converts 96 cents per dollar into useful heat. The efficient system uses two-stage heating and a constant-torque motor, which adjusts the airspeed according to demand. This heating system is dual-fuel capable, which means it can work with a heat pump to run on gas or electricity. The furnace improves air quality during summer by removing moisture.

Lennox G8 Furnace Manual Thermostat

EL296V

This energy-efficient furnace is a great deal. The unit has a 96 percent AFUE rating, which can save hundreds of dollars per year on energy bills. This gas furnace uses two heat exchangers and a variable-speed blower for enhanced comfort, humidity control and efficiency. The unit features sound-absorbing insulation and uses natural gas.

EL280

An energy-efficient model, this two-stage gas furnace adjusts its flame size to fit the heating demand, ensuring optimum heating while reducing energy costs. The unit has an AFUE rating of 80 percent, is dual-fuel capable and can be paired with a heat pump. This natural-gas furnace from Lennox features a fully insulated cabinet, which ensures quiet operation.

EL195E

This cost-effective, single-stage furnace has an exceptional AFUE rating, 95 percent, making it one of the most efficient furnaces in its class. The unit uses a power-saver constant-torque motor, which offers consistent heating and quiet operation. This furnace features sound-absorbing insulation and uses natural gas.

ML195

This budget-friendly furnace is also exceptionally energy efficient. This single-stage gas furnace boasts an AFUE rating of 95 percent. The system has two heat exchangers and a tightly sealed blower compartment. This natural-gas furnace is dual-fuel capable and can pair with a heat pump for peak efficiency.

ML193

Another economical furnace, this model does not compromise on performance or efficiency. The natural-gas furnace has an AFUE rating of 93 percent and uses two heat exchangers. The unit is dual-fuel capable and can pair with a heat pump to run using electricity.

ML180

This cost-effective gas furnace from Lennox has an AFUE rating of 80 percent. The furnace has a single heat exchanger and a robust blower assembly. This heating system runs on natural gas.

ELO183

EL280

An energy-efficient model, this two-stage gas furnace adjusts its flame size to fit the heating demand, ensuring optimum heating while reducing energy costs. The unit has an AFUE rating of 80 percent, is dual-fuel capable and can be paired with a heat pump. This natural-gas furnace from Lennox features a fully insulated cabinet, which ensures quiet operation.

EL195E

This cost-effective, single-stage furnace has an exceptional AFUE rating, 95 percent, making it one of the most efficient furnaces in its class. The unit uses a power-saver constant-torque motor, which offers consistent heating and quiet operation. This furnace features sound-absorbing insulation and uses natural gas.

ML195

This budget-friendly furnace is also exceptionally energy efficient. This single-stage gas furnace boasts an AFUE rating of 95 percent. The system has two heat exchangers and a tightly sealed blower compartment. This natural-gas furnace is dual-fuel capable and can pair with a heat pump for peak efficiency.

ML193

Another economical furnace, this model does not compromise on performance or efficiency. The natural-gas furnace has an AFUE rating of 93 percent and uses two heat exchangers. The unit is dual-fuel capable and can pair with a heat pump to run using electricity.

ML180

This cost-effective gas furnace from Lennox has an AFUE rating of 80 percent. The furnace has a single heat exchanger and a robust blower assembly. This heating system runs on natural gas.

ELO183

This Lennox oil furnace has excellent heating capabilities. This cost-effective model has an AFUE rating of 83 percent. With a powerful combustion chamber and a heavy-duty fuel pump, this oil furnace offers reliable performance. Instead of natural gas, the unit uses diesel fuel oil.

Lennox Furnace Pricing

Factors like home size, installation cost, and furnace type all affect how much Lennox furnaces cost. Due to variables involved in the final cost, Lennox does not disclose individual unit prices. For the most accurate information on pricing, contact a local HVAC professional.

The baseline Lennox furnace price system splits into three tiers: from highest to lowest, the Dave Lennox Signature Collection series, the Elite series and the Merit series. The following table includes the warranty pricing extensions that Lennox offers for each tier.

Lennox Furnace Warranties

Basic Limited Warranties:

• Dave Lennox Signature Series
  • 10 years on covered components
  • 10 years on compressor
  • 20 years or limited lifetime on the heat exchanger (model dependent)
• Elite Series
  • Five years on covered components
  • 10 years on compressor
  • 20 years or limited lifetime on the heat exchanger (model dependent)
• Merit Series
  • Five years on covered components
  • Five years on compressor
  • 20 years on heat exchanger

Extended Warranties:

• Parts
  • Extends warranty for Lennox furnace parts on some Merit and Elite models up to 10 years from the standard five.
• Heat Exchangers
  • Enhances the heat exchange warranty into a limited lifetime warranty for the Merit series ML195DF and ML195UH.
• Mini-Splits
  • Augments limited warranty and extends coverage for five years on Lennox furnace parts and seven years on compressors.

Lennox Furnace Reviews

For an in-depth perspective of each model, you can read customer reviews to see how satisfied homeowners are with their Lennox furnaces. When researching reviews, keep an eye out for information about reliability, energy efficiency, installation costs and heating evenness.

Frequently asked questions

Lennox G8 Furnace Manual Transfer Switch

Price varies by model, the size of your home and installation costs. As such, Lennox does not list specific prices on their furnaces. To get the most accurate estimate, speak to a local HVAC specialist.

You can choose your model and series through the Lennox website and speak to one of their sales representatives. You can also contact a local HVAC specialist who can obtain and install the furnace.

Lennox furnaces tend to last an average of 15-20 years.

Heat exchanger can crack for various reasons and should be checked every time furnace is repaired or maintained.

Visually check heat exchanger for cracks

• You will find most cracks form near the back and where the heat exchanger metal bends, Since this is where it will be weakest due manufacturer weakening the metal by bending it.
  Watch the flames as the furnace fan starts if you see the flames are blowing around or out the front of the burners then you will need to take a closer look at the heat exchanger

Water test

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• This test worked best on the old Lennox G8 and would find cracks or pinholes on the heat exchanger that sometime could not be seen.
  If there is no air conditioning then it will be easy to access above the heat exchanger through the humidifier. Once the heat exchanger cools down spray water on the heat exchanger from the top insuring full coverage and being careful of the electronics and motors. Then watch inside the burners for water to seep through, A good heat exchanger will not let moisture into burner chamber

Using carbon monoxide detector

• Test for carbon monoxide at return air as well at supply air and compare the two readings or test at supply air with burners on then off making sure furnace is not back drafting and compare.
  If you take reading once and only at supply air you will not be 100 percent sure the problem is with the heat exchanger. You are testing the accumulation of carbon monoxide over a long period of time from other sources like the furnace or hot water tank back drafting also it could be from outside sources like a vehicles near the intake air.

Lennox G8 Furnace

Reasons for cracks

• If the furnace does not have enough combustion air it will cause the furnace to run hotter then designed. Then with more expansion and contraction in the heat exchanger it causes cracks. The gas pressure must be set as per furnace name plate derated for location altitude if too much gas heat exchanger will run too hot.Blower speeds must be checked by comparing furnace temperature difference to name plate rating if running too hot increase fan speed and recheck temperature supply air minus return air.

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Any crack in a heat exchanger is dangerous and the heat exchanger must be replaced when crack is found

Lennox Diplomat Furnace Manual

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Tagged: carbon monoxide, cracked heat exchanger, heat exchanger