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The Williams 3003622 has been discontinued
Williams ***9622 1
Williams 3509822

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

Attractive styling, economical and safe heating comfort is achieved with this popular home furnace. Compact, space saving direct-vent heaters feature low cost installation and come equipped with all vent material. Heat only the room you're in while saving fuel costs in unused areas. This furnace's design features a sealed combustion chamber, making it great for garage or workshop heating. 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 8927 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

  • No electricity required
  • "Matchless" pilot igniter
  • Easy installation - all vent material included
  • All vent caps include built-in "Bird Guard"
  • Long-life, creamic-coated combustion chamber
  • Automatic temperature and safety controls
  • Sealed combustion chamber requires no room air
  • Attractive, durable, soft-white, scratch-resistant finish
  • Themostat included


Heating Capacity

The amount of heat, rated in BTUs that the item can produce.

Heating Capacity
30000 BTU
Effective Heating Capacity (BTUs)
73 %
Efficiency (% AFUE)

The percentage of energy converted into output by the unit. The remaining percentage is lost during the conversion process. The higher the efficiency, the lower the operational cost.

Efficiency (% AFUE)
66 %
Electrical Requirements
None (Self-Generating)
Fuel Type
Liquid Propane Convertible / Natural Gas
Ignition Type
Matchless Pilot
Equipment Type
Wall Furnace
Exhaust Venting
Maximum Wall Thickness
24 inches
Product Weight
100 lbs
Meets CSA Standards

Canadian Standards Association

Meets CSA Standards
Meets Canadian OEE Standards

Standards established by Canada's Office of Energy Efficiency.

Meets Canadian OEE Standards
32 1/8 Inches
10 1/4 Inches
28 Inches
Parts Warranty
1 Years
Combustion Chamber Warranty
10 Years