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  • Mr. Heater, Propane 18,000-BTU

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    The Mr. Heater Big Buddy™ provides temporary heat for barns, sheds, cabins, campers, patios, garages, sporting events, hunting blinds and more. Dual heating system combines radiant heat comfort with convection heat air flow for maximum heating efficiency. 4000, 9000 and 18,000 BTU with the capacity to heat up to 400 square feet for up to 108 hours on 20-lb. propane tank.



    Portable Heat for Anywhere, Any Time

    The Mr. Heater Big Buddy™ Heater is the rugged and ready travel companion for keeping you toasty warm at work, at play or in emergencies — great for decks, patios, cabins, RVs, sporting events, tailgating, sheds, barns and more. Wherever it is needed, the Big Buddy Heater's sturdy handle makes carrying easy.

    Heat and Fuel Options

    The Mr. Heater Big Buddy Heater features a dual-heating system, combining radiant heat comfort with convection heat air flow for maximum heating efficiency. Choose three heat settings (4000, 9000 or 18,000 BTU) for the perfect comfort level every time. The Big Buddy heater can be powered using one or two 1-lb. propane cylinders or a 20-lb. cylinder (none included). Heat up to 108 hours on a single 20-lb. propane tank with the optional hose connection (not included).


    Designed to Last

    You can count on the Mr. Heater Big Buddy Heater to deliver comfortable warmth season after season. Engineered with dual ceramic burner tiles with shock-absorbing floating insulation to provide extra durability. High-temperature heavy-duty safety wire guard prevents damage and mishaps. The handy fully enclosed fuel compartment protects and hides propane cylinders.


    Safe, Effective and Easy to Use

    Features + Benefits

    Features + Benefits

    Features for Mr. Heater Big Buddy Indoor/Outdoor Propane Heater — 18,000 BTU, Model# MH18B
    • Up to 108 hours of use
    • CSA certified
    • Uses one or two 1-lb. or one 20-lb. propane tank (propane not included) with optional hose connections (Items 173645, 173646)
    • Blower fan uses A/C adapter (Item# 172641, sold separately) or 4 D-cell batteries (not included)
    • Minimum tank size: 1 lb.
    • Not for sale in MA

    Key Specs

    Manufacturer's Warranty12 months parts / 12 months labor
    Ship Weight19.0 lbs
    Category TypeForced air
    Needs Direct VentingNo
    Heating Capability (sq. ft.)400
    Heat Settings3
    BTU Output18,000
    Clearance from Corner (in.)6
    Clearance from Rear Wall (in.)6

    Clearance from Side Wall (in.)6
    Thermostat IncludedNo
    Blower IncludedYes
    Blower Power Supply (Volts, Amps)110
    Fuel Consumption (gal./hr.)3–12 hrs. on two 1-lb. tanks, 50–220 hrs. on two 20-lb. tanks
    IgniterMatchless push-button starter
    Oxygen Depletion SensorYes
    Remote IncludedNo
    Dimensions L x W x H (in.)18 3/4 x 11 x 16 7/8