Williams 35,000 BTU Counterflow Top Vent Natural Gas Wall Heater

Item # 311800049 | Williams Part # 3508632 | UPC Code 093909298869 | UNSPSC Code 40101819
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Product Overview

This 35,000 BTU top-vent counterflow wall furnace delivers strong, even heat for rooms up to 800 sq. ft., offering dependable comfort as a natural gas wall heater for larger living areas, workshops, cabins, and home additions. Its gravity-flow counterheat design circulates warm air from the ceiling downward, helping the appliance perform smoothly and reliably as a vented natural gas heater during everyday use. A built-in thermostat helps maintain consistent temperatures, and pilot ignition supports quick startup in colder weather. The unit may be recessed into the wall or surface-mounted, giving homeowners installation flexibility when adding an indoor natural gas heater to new or existing spaces. Quiet operation, a slim design, and a clean white finish make it suitable for a wide range of interior styles, while safety controls and automatic shutoff promote dependable long-term performance. With durable construction and efficient heat delivery, this natural gas room heater supports households seeking reliable natural gas heaters for indoor use capable of warming larger rooms with steady, comfortable airflow.

  • This top vent counterflow natural gas model heats up to 800 sq ft and works as a dependable natural gas room heater for larger areas
  • The gravity design promotes quiet circulation and stable daily output from this vented natural gas heater
  • Thermostat control and pilot ignition support consistent performance of the natural gas wall heater across seasons
  • Recessed or surface mount installation makes the indoor natural gas heater adaptable to new or existing layouts
  • This natural gas heater for indoor use is durable and has built-in safety features to support long-term comfort

Proposition 65 Information

Prop65 Warning Icon WARNING: This product can expose you to chemicals including epichlorohydrin which is known to the State of California to cause cancer and birth defects and/or other reproductive harm. For more information go to www.p65warnings.ca.gov

Specifications

Annual Fuel Utilization Efficiency (AFUE) (%)
75
Area Heated (Sq. Ft.)
750
Automatic Shut-Off
Yes
Certifications and Listings
ANSI Certified, CSA Listed
Color
White
Connection Size
1/2" NPT
Fuel Type
Natural Gas
Heat rating (BTU/hour)
35000
Heater Type
Other
Ignition Type
Pilot
Indoor/Outdoor
Indoor
Manufacturer Warranty
Refer to Williams' Limited Warranty for warranty information
Pack Size
1
Product Depth (in.)
10.1
Product Height (in.)
72.5
Product Weight (lb.)
90
Product Width (in.)
14.1
Thermostat
Yes
Timer
No

Warranty

Refer to Williams' Limited Warranty for warranty information