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35,000 BTU, 69% AFUE, Top-Vent Wall Furnace, Monterey Plus Top Air Outlet, Natural Gas, No Electricity Required

35,000 BTU, 69% AFUE, Top-Vent Wall Furnace, Monterey Plus Top Air Outlet, Natural Gas, No Electricity Required

Model: Williams 3509822

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Model: Williams 3509822

You save: 25%
Compare to: $1,050.69
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In Stock and Ready to Ship
If ordered by 1PM CST M-F, ships same day. All items on your order must be in stock for same-day shipping.

To use LP fuel, this unit requires an LP Conversion Kit. See Accessories

IMPORTANT: As of 2019, Williams no longer offers high-altitude models.  If you live above 2000 feet, be sure to purchase the high altitude kit listed in Accessories.  The kit contains a selection of orifices that cover elevations up to 8,000 feet.


The Monterey PLUS + Home furnace series provides traditional home comfort with lower heating costs, convenience and high-efficiency! Value-for-your-money-priced models feature energy and money-saving operating costs. Easily recessed or surface-mounted options are great in homes, schools, cabins, apartments, offices, and shops. Heating rooms individually allows comfort in areas being used while saving fuel cost in unused areas. No electricity required, great during power outages. It is direct vented with a "Matchless" pilot igniter, automatic thermostat and safety controls included. Unit comes from factory set up for natural gas. In order to operate on LP (liquid propane), the Williams 8908 LP Conversion Kit must be purchased seperately.

Important Safety Notice:  The surface temperature of wall furnaces can exceed 200 degrees Fahrenheit. Avoid touching the furnace while it is in use. If children will be present, provide a physical barrier to prevent accidental contact with the furnace.

Please read this additional Important Safety Notice.

Standard Features

  • High-Efficiency Monterey Models
  • No electricity required
  • "Matchless" pilot igniter
  • Easy installation 
  • Patented, side-relief opening draft hood design reduces flue gas temperature to minimize normal heat loss.
  • Automatic temperature and safety controls
  • Ressetable vent-limit safety switch
  • Thermostat sold separately (Millivolt capable thermostat required)




0-2000 ft.
Heating Capacity
35000 BTU
Effective Heating Capacity (BTUs)
71 %
Efficiency (% AFUE)
69 %
Electrical Requirements
Fuel Type
LP Capable (Kit Required) / Natural Gas
Ignition Type
Matchless Pilot
Equipment Type
Wall Furnace
Exhaust Venting
Product Weight
83 lbs
16 Inches
9.5 Inches
65.75 Inches
Heat Exchanger Warranty
10 Years
Parts Warranty
1 Years
Combustion Chamber Warranty
10 Years

Enjoy free shipping on any accessories purchased with the Williams 3509822.

Air Boosters
Tjernlund AS1
75 CFM Room-to-Room Ventilator, 120 VAC Hardwired
Digital Thermostats
Honeywell TH6110D1005
FocusPro 6000 Universal Programmable Thermostat - One Stage Heat One Stage Cool (Standard Screen)
Honeywell TH5110D1006
FocusPro 5000 Universal Non-Programmable Thermostat - One Stage Heat One Stage Cool (Standard Screen)
Furnace High Altitude Adapter Kits
Williams 9A332
High Altitude Conversion kit - 2001' - 8000' for Monterey Plus 35,000 Btu/hr. Natural Gas Top-Vent Furnace
Overstock Deals!
Williams 2901
100 CFM Blower Motor Assembly for Top Air Outlet, Top-Vent Wall Furnaces
Wall Furnace LP Conversion Kits
Williams 8908
LP Gas Conversion Kit for Williams 35098 Series Top Air Outlet, Top-Vent Wall Furnace
Wall Furnace Venting Products
Williams 9902
Vent Adapter (for Surface-Mounted Installations without Blower Accessory)
Williams 9929
Oval Vent Starter Kit for Top-Vent Wall Furnaces
Williams 4901
Free Standing Kit - 102" Maximum Height
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