WoodMaster – LT90 Outdoor Wood Furnace

LT90 specifications:

  • Fire Box 34″ x 32″
  • Door Size 16″ x 16″
  • Thickness: 1/4″ fire drum & water jacket
  • Draft Control: Fan
  • Overall Size 7′ x 5′ x 6′
  • Heating Capacity 90,000 Btu
  • Total Water Capacity 120 gallons
  • Limited Lifetime Warranty
  • Shipping Weight 1,800 lbs.


The Outdoor WoodMaster LT90Wood Furnace is ideal for heating multiple buildings, including an office building or workshop. WoodMaster furnace owners get more usable heat from more affordable, cleaner sources. Each WoodMaster wood furnace is specifically engineered to efficiently heat your entire home or other spaces. You save money every time your WoodMaster kicks in. You also stay insulated from fluctuating fuel oil, natural gas and other prices. And WoodMaster dealers have no-hassle financing available. Freestanding, easy-to-operate WoodMaster furnaces work with most existing heat systems, including hot water, forced air, hydronic heat, radiant baseboard, existing water to-water and in-floor. A WoodMaster furnace serves as a primary heat source or in conjunction with existing systems to warm homes of all sizes, garages, workshops, pools, whirlpools, spa areas and other spaces, plus hot water systems.


Each WoodMaster furnace is installed outdoors, from 25 – 400 feet from the home or structure(s) that it will heat. A core fire box is surrounded by a water jacket. The fire warms water to its optimal heating temperature, maintained by automatic controls. The warm water moves through insulated underground piping into the home’s heat exchangers and heating systems. Inside, you control the temperature with your thermostat.

WoodMaster has ETC

The digital accuracy and energy saving features of the Electronic Temperature Control system were firsts in the industry and come standard with all of our furnaces. An important energy-saving feature of the ETC is the low temperature shut off. This precise controller provides one convenient center for operating the temperature settings, blower, reset, water level indicator and night light, all with an easy-to-read digital display.

The WoodMaster furnace also:
• Produces very little ash for reduced cleanup work
• Produces virtually no creosote, a major cause of chimney fires
• Helps decrease U.S. dependence on imported oil
• Provides carbon-neutral heat, which doesn’t contribute to increased greenhouse gases

Incomparable safety

WoodMaster furnaces operate so no fuels enter the house, which eliminates smoke and soot, fire hazards, and reduces the risk of dangerous carbon monoxide buildup.


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