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Model # W9M100-421

Internet # 202771088

100,000 BTU 95.5% Multi-Positional Gas Furnace

This item has been discontinued.
The Home Depot no longer carries this specific product.

$1,664.82 /each

  • 100,000 BTU natural gas heat is maintenance free
  • Product sold without installation or permitting
  • Equipment should be sized/installed by a qualified professional




Model # W9M100-421

Internet # 202771088

Ideal for new or replacement residential or commercial installations. The100,000 BTU W9M Series 95.5% efficiency multi-positional gas furnaces have a 33 in. tall cabinet and are designed for installation in up-flow, down-flow, and horizontal applications. These single stage, high efficiency furnaces are natural gas ready and convertible to propane (LP Gas) with the optional LP 347 conversion kit. Factory shipped for installation in up-flow and horizontal applications and can be easily converted for down-flow applications. Certified for Category IV venting and may be vented either through a side wall or roof applications using approved plastic as allowed by the National Fuel Gas Code. Features an electronic hot surface igniter for increased safety and efficiency, and adjustable speed maintenance free direct drive blower that never needs lubrication, and self diagnostic control module to monitor operation. The primary heat exchanger is constructed of tubular aluminized steel and has a stainless steel secondary heat exchanger. Units are factory assembled, wired and tested to assure safe dependable and economic installation and operation. NOTE: Requires 1/2 in. input to gas valve, dedicated circuit breaker, and 120-Volt wiring with proper polarity and ground. 5 year limited parts warranty; lifetime limited heat exchanger warranty, 10 year heat exchanger warranty on commercial applications. Dimensions: 33in. H x 21 in. W x 29.5 in. D. Not certified for mobile home use.

  • Natural gas ready and may be converted to LP gas with optional conversions kit
  • Multi-positional design with compact cabinet height of 33 in. for flexible installation
  • High tech tubular aluminized primary and stainless steel secondary heat exchangers
  • Maintenance-free, multi-speed, permanently lubricated direct-drive blower motor
  • Built-in, high level self diagnostics with fault code displays standard on integrated control module for reliable operation
  • Venting applications - may be installed as either 2-pipe(sealed combustion) or single-pipe vent (using indoor combustion air)
  • Equipment should be sized, selected and installed by a qualified professional to ensure proper installation, safe operation, adherence to federal, state and local codes and for valid warranty; see installation guide for more details
  • Professional installation recommended
  • Click here for more information

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Annual Fuel Utilization Efficiency (AFUE) (%) 
Energy Consumption (kWh/year) 
Fuel Gauge 
Gas or Electric 
Heat rating (BTU/hour) 
Heating Product Type 
Forced Air Furnace 
Heating Technology Type 
Number of Blower Speeds 
4 or More 
Power/Fuel Type 
Natural Gas 
Product Weight (lb.) 
127.0 lb 
Warranty / Certifications
Certifications and Listings 
CSA Listed 
ENERGY STAR Certified 
Manufacturer Warranty 
5 Years - Limited on parts / Limited Lifetime on heat exchanger 


Rated 4.6 out of 5 by 5 reviewers.
Rated 3.0 out of 5.0 by Solid performance difficult installation The installation of the product is not something to be taken lightly. expecially if you are using downdrafting for your ventilation. This is a selling feature of the product over the typical stack mounted venting systems but it creates water as a byproduct. There isn't one but two water exhaust's on this machine and one requires a pump to move the water upstream. This isn't stated in any documentation I've seen. This all being said the fuel use is excellent and the heating ability once the system quirks were figured out is quite good. I would recomend this if you are exceptionally handy. If not get an installer who knows this type of system or you'll have allot of callbacks. January 15, 2013
Rated 5.0 out of 5.0 by Happy Camper Ordered the 120K unit. The company rep called me and reviewed my needs. Changed to 100K unit. Purchased the LP gas conversion unit. I wanted to install it myself. I read through all the instructions several times, and had a licensed installer review everything I did. I not sure if he was surprised how good the instructions were, or if he was shocked by how closely I followed them, but everything went great. Changing from natural gas to LP was not a problem. I even bought a manometer to keep an eye on the LP gas pressure since I've never used LP before. The furnace worked the first time it was turned on. I purchased it in Oct, but family health issues delayed the installation. It went into service on 12/21/12 it has kept us nice and warm. It had a cosmetic dent from shipping, but I just straightened it out. February 4, 2013
Rated 5.0 out of 5.0 by This is a great furnace! This was a great replacement of my old lennox. It is a nice compact size. It was a pretty simple installation overall. I converted mine to LP which does require a manometer to set the gas valve pressure. The instructions were very detailed. It is very light, I think it weighed 70 pounds on the pallet. October 24, 2013
Rated 5.0 out of 5.0 by This product is well built. Also compact for what it rated to put out. Works well doesn't take long to heat up an 1800 sq. ft. garage. October 15, 2013
Rated 5.0 out of 5.0 by Great heater! We now have plenty of heat and are very comfortable. November 19, 2013
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