Williams 35,000 BTU/Hr Monterey Top-Vent Gravity Wall Furnace Natural Gas Heater with Wall or Cabinet-Mounted Thermostat-3509622A - The Home Depot


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

Williams 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).

California residents: see  Proposition 65 information

  • 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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Assembled Depth (in.)  6 in  Assembled Height (in.)  65.75 in 
Assembled Width (in.)  16 in  Product Depth (in.) 
Product Height (in.)  65.75  Product Width (in.)  16 in 
Accessories Included  No  Automatic shutoff  Yes 
Color  White  Color Family  Whites 
Fuel Gauge  No  Fuel Type  Gas 
Heat rating (BTU/hour)  35000  Heater Type  Vented 
Heating Product Type  Gas Wall Heater  Heating Technology Type  Convection 
Ignition Type  Pilot  Indoor/Outdoor  Indoor 
Installation  Recessed/Surface Mounted  Power/Fuel Type  Natural Gas 
Product Weight (lb.)  83 lb  Remote Control  No 
Returnable  90-Day  Room Size (sq. ft.)  Greater than 900 
Thermostat  Yes  Timer Included  No 
Vented  Yes 
Warranty / Certifications
Certifications and Listings  CSA Listed  Manufacturer Warranty  Refer to Williams' "Limited Warranty" for details. 


Rated 4.0 out of 5 by 55 reviewers.
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 issue...so 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 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 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 Excellent Replacement for Older Model Successfully replaced a much older model, with a bit of flue modification. Contractor said this was just a tiny bit bigger, but mostly fit right into the space, with higher quality parts. Still works without electricity, which is important on an island where we lose power frequently. A good value for our rental cottage. Used in-store pick-up. Process was well-organized and staff friendly at the W Seattle Home Depot. Thanks for making our furnace replacement manageable and cost-efficient! March 24, 2015
Rated 5.0 out of 5.0 by A Chip off the old block, only better This wall furnace succeeded its predecessor. OUTSTANDING product. Monterrey Wall Furnaces do what they say and are "there for the long haul." The old one came out and the new one went in with existing hardware/venting/thermostat and didn't miss a beat. The old furnace lasted over 20 years and only had to be replaced because of obsolete parts. This one will "replicate that feat" I am sure. March 24, 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
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 1.0 out of 5.0 by Only works when I press the vent limit switch I just bought last week and the day it was installed it worked the first time I turned the heat up to about 75 deg. Ever since, I have to press the vent limit switch in order to get it to turn on. It seems something is broken or not working properly from the first day I started it up. I replaced the thermostat with a nice programmable Honeywell to see if that would help, but same issue. I have to press the vent limit switch in order to get it started. Pilot light is fine, just won't heat up until vent limit switch is pressed. Don't know what to do except pay contractor who I paid to install it to now uninstall it and return it. That or see if PG&E will take a look at it. March 3, 2015
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