Model # W9M100-421

Internet #202771088

Store SO SKU #1000293383

Winchester 100,000 BTU 95.5% Multi-Positional Gas Furnace


100,000 BTU 95.5% Multi-Positional Gas Furnace

  • 100,000 BTU natural gas heat is maintenance free
  • Product sold without installation or permitting
  • Equipment should be sized/installed by a qualified professional
$164010 /each
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Product Overview

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
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Info & Guides

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Name 60,000 BTU 95.5% Multi-Positional Gas Furnace 100,000 BTU 95.5% Multi-Positional Gas Furnace 120,000 BTU 95.5% Multi-Positional Gas Furnace 95% AFUE 90,000 BTU Downflow Residential Natural Gas Furnace
Brand Winchester Winchester Winchester Kelvinator
Ratings (6) (5) (1) (1)
Annual Fuel Utilization Efficiency (AFUE) (%) 95.5 95.5 95.5 95
Heat rating (BTU/hour) 57000.0 95000.0 114000.0 90000
Power/Fuel Type Natural Gas Natural Gas Natural Gas Natural Gas
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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.)

Warranty / Certifications

Certifications and Listings
CSA Listed
Manufacturer Warranty
5 Years - Limited on parts / Limited Lifetime on heat exchanger

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Customer Questions & Answers

Sizing furnace BTUS to my house

How do I choose a BTU size furnace for my home?
Asked by: paulpkc
I have a 2244 sq. foot house, what size furnace do I need.
Answered by: John
Date published: 2017-03-23

cost of installation

convert to natural gas
Asked by: Dave
The equipment is offered separate from the installation so that you can arrange for your own installation from a reliable, local, qualified technician. The furnace is Natural Gas ready from the factory.
Answered by: HHP Tech Support
Date published: 2017-07-17

Is it noise?

Asked by: irene
Actually, my response is to the tech. Noise is not relative, it's absolute, measurable at the source. You could have told him something like 76 decibel at 3ft. The he can determine if that is loud for his preference.
Answered by: Nickheat
Date published: 2017-06-19

High Altitude

I need a furnace that can operate at 11,000 ft. Can this unit be adjusted for that elevation?
Asked by: Snowsnake
All our furnaces can be operated at high elevations with a high altitude kit. Hamilton customer service reps review each order placed and contact customers prior to shipping to verify sizing, application, recommend addition items that might be needed, and to answer other questions that you might have.
Answered by: HHP Tech Support
Date published: 2016-07-14
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Customer Reviews

100,000 BTU 95.5% Multi-Positional Gas Furnace is rated 4.6 out of 5 by 5.
Rated 3 out of 5 by from 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.
Date published: 2013-01-15
Rated 5 out of 5 by from 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.
Date published: 2013-02-05
Rated 5 out of 5 by from 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.
Date published: 2013-10-24
Rated 5 out of 5 by from 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.
Date published: 2013-10-15
Rated 5 out of 5 by from Great heater! We now have plenty of heat and are very comfortable.
Date published: 2013-11-19
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