Williams 3512521A

WIL 3512521A
Images are representative of the product, actual product may differ.

Williams 3512521A

WIL 3512521A


Williams 3512521 - 35,000 BTU LP Fireplace-Look Vented Hearth Heater (2,001 ft to 4,000 ft Elevation)

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Williams 3512521 - 35,000 BTU Propane Gas Fireplace-Look Front Vented Room Console Hearth Heater

This is a High Altitude Model for 2,001 ft to 4,000 ft Elevation - See Other Vented Heater Models for 0 ft to 8,000 ft Elevations

Enjoy instant warmth plus lower heating cost with a traditional enclosed or fireplace-look vented heater. These heaters provide comfort to hard to heat areas, designed for maximum efficiency, low fuel consumption, and quiet operation.

This heater is designed for Propane Gas, see our other Vented Heaters for Natural Gas models. If you already have an existing heater and just need to convert it, see the "Available Accessories" below for the Gas Conversion Kit.

Product Features:

  • No electricity required!
  • All models include a "matchless" pilot igniter, assures convenient lighting without matches!
  • No electricity required. All Models are equipped with a self-generating millivolt thermostat that may be wall or cabinet-mounted.
  • Contemporary Black finish, powder-coat, scratch resistant finish to complement any decor.
  • Burners engineered for quiet ignition and maximum heat efficiency.
  • Louvered-top design and front grille for improved heat circulation.
  • Factory-installed ceramic fiber logs (fireplace models only).
  • Natural and propane models (Conversion kits available).
  • Automatic temperature and safety controls.
  • Resettable vent-limit switch.
  • Thermostat included!

Product Specifications:

  • BTU/hr. Input: 35,000
  • BTU/hr. Output: 25,000
  • Efficiency Percentages:
    • Thermal: 71.0
    • AFUE: 68.0
  • Dimensions (Width x Depth x Height): 25" x 15-3/8" x 28-7/8"
  • Vent Size: 4"
  • Center of Vent to Floor: 21-3/8"
  • Gas Connection: 1/2"
  • Shipping Weight: 81 lbs
  • See additional image for safety clearance information.

Available Accessories (See Accessories Below for Link):

  • Need to heat a larger room? A heavy-duty quiet 150 CFM 120V blower is available! (WIL 2102)
  • Protect your floor with the Heavy Duty Floorboard (WIL 4167)
  • 4" Vent Collar (WIL 9104)
  • Gas Conversion Kit Natural Gas to Propane Gas (WIL 8950)

Important Information:

  •  Read owner's manual before using/installing.
  • Photographs are representative.
  • Check local codes and ordinances for permitted uses.
  • Consult installation manual for clearances prior to installation.
  • Product specifications may be amended without notice.
  • Installation and servicing recommended by qualified service person.
  • Venting must comply with installation manual.
  • Massachusetts approval G1-0713-515.
  • Please read warranty for any limitations for disclaimers.
  • Combustion chamber carries a 10 year limited warranty. All other parts carry a 1 year limited warranty.


SeriesVented Hearth Heaters
Input BTU35,000
Power TypePropane (LP)
AFUE Efficiency %68
Operating Altitude2001 ft to 4000 ft
Thermal Efficiency %71
Vent TypeVented
Vent LocationRear
Design StyleFireplace-Look
Includes BlowerNo
Equipment DescriptionVented Heaters
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