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Home>Popular Gas Heaters

Mr. Heater MH18B 18,000 Btu Big Buddy Indoor Safe Portable Propane (LP) Heater

Part Number MH18B
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Mr. Heater MH18B 18,000 Btu Big Buddy Indoor Safe Portable Propane (LP) Heater
Mr Heater Big Buddy Portable Heater
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Mr Heater Gas and Propane Heaters

The latest evolution in powerful and portable heat is here! BIG Buddy from Mr. Heater now takes portable heat to another level - 18,000 BTU/HR with the capacity to heat up to 400 square feet of space for up to 220 hours (on low position).  BIG Buddy's Dual-Heating System (DHS) combines radiant heat comfort with convection heat airflow for maximum heating efficiency.

Multi position heat settings of 4,000, 9,000 and 18,000 BTU / HR control comfort level. Built in oxygen shutoff sensor and tip over switch ensures indoor safe operation (adequate ventilation must be provided; see operating instructions).  Certified by CSA International (American Gas Association), Mr. Heater's Big Buddy Indoor Safe Portable Heater features a low oxygen safety shutoff pilot to provide safe, reliable propane heat indoors.

Special Features:
  • Ergonomic Easy Carry Handle
  • Low Oxygen Shutoff Pilot Safety System For Indoor & Outdoor Use
  • Blower Fan Power On / Off Switch
  • Uses optional A/C Adapter Or 4 D Cell Batteries To Power Blower Fan
  • Large 4 Position Heat Level Control Knob With Built-In Piezo Starter
  • Integrated Hot Air Blower Venting System
  • Attached Swing Open Doors with Swivel Out Mount For Easy Cylinder Installation
  • Porcelain Coated Reflector For Extended Life
  • Dual Ceramic Burner Tiles With Shock Absorbing Floating Insulation
  • High-Temperature Coated Safety Wire Guard
  • Non Skid Surface Pads For Extra Stability
  • Key Shaped Rear Mounting Holes For Wall Mounting
  • Built In Tip Over Shutoff Switch
Temporary Heat For Barns / Sheds, Cabins / Shelters, Tents / Campers / RVs, Workshops / Worksites, Porches / Patios / Decks, Garages / Storage Buildings, Picnics / Tailgate Parties, Sporting Events, Hunting Blinds, Ice Fishing Shanties, Truck and Horse Trailers and Emergency Heat
Mr Heater 
CSA Certified For Indoor & Outdoor Use

Not designed for permanent installation or for use above 7,000 feet 

When using a 20 lb. propane tank, place cylinder outdoors
 Never bring a 20 lb. cylinder indoors
Mr Heater


  • Model No. MH18B
  • 4,000/9,000/18,000 BTU/Hr.
  • Gas: Propane
  • Operating Position: Vertical
  • Valve Position: Pilot, Lo, Med. & Hi
  • Heating Time:
  • One 1lb. Cylinder: 1.5 to 6 hour
  • Two 1lb. Cylinders: 3 to 12 hours
  • One 20lb. Cylinder: 25 to 110 hours
  • Two 20lb. Cylinders: 50 to 220 hours
  • Overall dimensions: 17L X 10W X 17.5"H
  Mr Heater Propane Heaters
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