(800)865-5931 Monday to Friday 8:00 AM - 5:00 PM Central
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The Williams 1556541 has been discontinued.
Please call us for a suitable alternate product.

(800) 865-5931

Monday - Friday

8:30 AM - 5:00 PM Central

Get quick efficient warmth without the need for venting or electricity. These 99.9% efficient heaters have low fuel consumption, quiet operation and even heat distribution throughout the room.  Convection causes room air to circulate from the floor upward along the front, back, and sides of the heater, and then back through the room.  Ceramic plaques behind the grille give this heater a warm, attractive glow.

Williams Unvented Infrared Heaters are shipped ready to install.  No electric power is needed for the heater except when the optional accessory blower is used (on applicable models).  Then, a standard 3-prong receptical (electrical outlet) is needed near the heater.  The heater cabinet is built of heavy gauge steel, treated for corrosion resistance and has an enamel paint finish.

Standard Features

  • 99.9% heating efficiency maintains heat in room
  • Matchless pilot ignitor
  • No electricity required - great for back-up heat
  • Mounts to the wall or on select models optional floor mounting base
  • Top-mounted controls
  • Oxygen Depletion Sensor (ODS) monitors room oxygen levels for safe operation
  • Powder coat finish that is scratch resistant
  • Optional quiet, heavy-duty blower on select models for larger rooms, where faster heat circulation is desired

Always consult your local heating or plumbing inspector, building department, or gas utility company regarding regulations, codes, or ordinances which apply to the installation of an unvented heater.  These products are not approved for use or sale in all or part of the following states: Alaska, California, Colorado, Massachusetts, Minnesota, Montana, New York and Utah.

Heating Capacity

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

Heating Capacity
15,000 BTU
99.9 %
Electrical Requirement
Fuel Type
Liquid Propane
Ignition Type
Matchless Pilot
Front Panel
Exhaust Venting
Product Weight
25 lbs
Meets CSA Standards

Canadian Standards Association

Meets CSA Standards
18 1/8 Inches
7 1/8 Inches
24 11/16 Inches
Parts Warranty
1 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.