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Model # 3509622A

Internet # 100059323

Store SKU # 861154

35,000 BTU/Hr Monterey Top-Vent Gravity Wall Furnace Natural Gas Heater with Wall or Cabinet-Mounted Thermostat

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

$429.00 /each
  • Rated for elevations up to 4,500 ft.
  • Resettable vent limit switch
  • Thermostat included; may be mounted on wall or furnace cabinet




Model # 3509622A

Internet # 100059323

Store SKU # 861154

Store SO SKU # 860980

Install the Monterey 35,000 BTU Natural Gas Top-Vent Wall Furnace between studs in the wall to provide a room with heat without the need for electricity. This wall furnace comes with a thermostat for temperature regulation and can be converted to run on liquid propane with an optional conversion kit (not included).

  • 35,000 BTUs for powerful heating
  • Thermostat may be mounted on the wall or on the furnace cabinet
  • Converts to propane with the optional conversion kit (not included) so you can choose the fuel type that fits your needs
  • Durable ceramic-coated combustion chamber for increased efficiency
  • Requires no electricity for operation
  • Rated for elevations up to 2,000 ft.
  • Matchless pilot igniter for safe use
  • May be converted to propane gas with the purchase of an 8914 conversion kit
  • Attractive, soft-white finish
  • Home Depot Protection Plan:

    Home Depot Protection Plan

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
16 in 
Accessories Included 
Automatic shutoff 
Color Family 
Fuel Gauge 
Fuel Type 
Heat rating (BTU/hour) 
Heater Type 
Heating Product Type 
Gas Wall Heater 
Heating Technology Type 
Ignition Type 
Recessed/Surface Mounted 
Power/Fuel Type 
Natural Gas 
Product Weight (lb.) 
83 lb 
Remote Control 
Room Size (sq. ft.) 
Greater than 900 
Timer Included 
Warranty / Certifications
Certifications and Listings 
CSA Listed 
Manufacturer Warranty 
Refer to Williams' "Limited Warranty" for details. 


Rated 4.0 out of 5 by 59 reviewers.
Rated 3.0 out of 5.0 by The good,the bad, and the ugly and all the above I bought this heater to replace a very old wall heating unit TEMCO that was leaking gas and carbon monoxide. The installation supposed to be quick and easy, but I still decided to hire a professional HVAC tech. However, it was nightmarish. It was very hard to fit the unit into an existing wall whole so I had extra expenditures on boards, insulation and spacers. The small over-heating sensor was mounted on the side of the unit and techs accidentally damaged it during installation, so needed to be replaced with a new one. Came with a cheap and BROKEN thermostat so I ended up buying a new one and paying extra for installation...thanks to Home Depot Customer Service that gave me partial credit for that. After installation the unit seemed to work fine except the noise. During the heating cycle the unit produces the normal sound( white noise) but after the temperature has been reached you can hear the clicking and nocking sounds from the chamber and the vent. Called the Williams Customer Service and they explained that this is normal-"metal is cooling off and the noise you hear is the trunk lines and chamber cooling down..'. So,since I sleep in that room -I better get used to the noise. April 21, 2015
Rated 4.0 out of 5.0 by Good Value for the money We own a seasonal summer cottage in Minnesota. We shut it down for the winter. I shopped around and bought this one to replace the old wall furnace of similar dimensions. To heat the place (800 sq. ft.) on cool autumn days & nights, it does a fine job so far. It has to be alot more energy efficient than the 50 yr old unit, right? How long it holds up remains to be seen (planned obsolescence?) I bought the blower accessory too, which is noisier than I had hoped, and underpowered compared to my last furnace. I place a portable fan nearby to move air more forcefully. The installer said it was not difficult to work with including lp conversion. I also bought a thru the wall fan which I'm very happy with too, and is in the photo (if it uploads). There was a manufacturing dent on the access panel which I was able to easily fix. I had a problem finding attic vent pipe. Home Depot does not offer it. I found Amerivent brand type B vent pipe at another home center via special order. Summary; so far, I'm happy, but longevity remains to be seen. I'll report back in a few years. November 8, 2012
Rated 5.0 out of 5.0 by Great purchase- warms my heart, my toes and didn't burn up my checkbook balance! My previous wall furnace was already hooked up to a chimney for venting, so it only took a few minutes to undo the previous gas line to pull out the old, and this new one was the exact same measurements and looked to be nearly identical in every way, so reinstall was a snap for my brother. It took him an hour and a half to put this in, and because of newer connections when I got a whole house furnace handling the upstairs of my house a few years ago, they put in the venting at that time so, I did not need any extra parts as some stated they had to get for a complete connection and to get it up and running. That was a priority to check out since so many complained of that install day went well with that knowledge. Its been in for a month now, and all seems to be working perfectly...and I hope it continues that way. The other it replaced was there for 35 years, and my brother said this one is actually made from better materials in the combustion chamber area. And I love the thermostat instead of having to crawl around on the floor to adjust the temp, just using the wall thermostat was a huge upgrade! December 10, 2014
Rated 3.0 out of 5.0 by great product but beware... ... home depot does not carry all the required parts needed to make it work for propane use and venting. Once we finally tracked down suppliers for the necessary gas to propane conversion kit & vent kit it worked great. The only other problem was fitting the cover on after mounting flush to the wall instead of partially recessed into the wall. The grate won't go on without yet another necessary conversion kit. Great product, works very well for heat, but there are too many conversion kits needed to actually make it work that home depot doesn't carry for this specific model. In the end we spent a lot more money on kits than the actual heater. Poor advertising home depot. March 3, 2015
Rated 5.0 out of 5.0 by Everthing correct and installed easily no modifications required. Picked up at store all paperwork in order, took to location where it was to be installed . Everything included purchased the GAS to Propane conversion. All well. September 28, 2015
Rated 5.0 out of 5.0 by Great value, easy install This unit replaced a 50 yr old unit. Getting the old unit out was more of a chore (2.5 hours) than putting the new one in (1.5 hours). The previous home owners had redone the exhaust system thinking that would fix the old unit that was not venting well. The problem was the seams had come apart on the old unit. This new unit worked perfectly and when checked with my detector it registered zero on carbon monoxide emissions into the home. I bought the 35K unit and It puts out a ton of heat too. I put this in myself but having a second person would make this a lot easier even though the weight of the main unit was only about 80 pounds. January 1, 2013
Rated 5.0 out of 5.0 by Its great. Needed to replace on from 1970 and it fit right in. September 29, 2015
Rated 5.0 out of 5.0 by Very Pleased! It was easy to install and heated very well! Thermostat included. No power needed, just gas! You could even turn your gas off when your away, to save even more! Easy re-light button, not that it is needed if you did not turn it off yourself. Just remember, unless you already have the exhaust parts, make sure to buy the Williams 5" exhaust starter kit ($110.00) and some double wall round pipe($15.00) to match your transition piece included in the kit. Especially if you are extending more than 4 feet with the exhaust. I always use double wall for safety even though this is natural flow. Do not forget your roof vent cap, extra trip ;) Thermostat wire is only about 4 feet worth in the kit, i would buy more thermostat wire since you should be putting the thermostat in a central location anyway . They had the old version of this unit that had to be plugged in the wall, it lasted 15 years, probably longer if they had maintained the unit and exhaust better. November 15, 2014
  • 2015-10-07T09:36:05.339-05:00
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