The Mr. Heater Big Buddy is the most popular portable propane heater in North America. This patented radiant 4,000-18,000 BTU liquid propane heater connects directly to two 1-lb. cylinders and is the perfect solution for heating up to 450 sq. ft. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built-in Piezo sparking mechanism will take care of the rest. With the Oxygen Depletion Sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable outdoor safe heat.
• 4,000, 9,000, or 18,000 BTU per hour
• For use with propane gas
• Heats up to 450 sq. ft.
• Single control start knob
• Hi-Med-Low heat settings
• Swivel regulators
• Automatic low oxygen shut-off system (ODS)
• Accidental tip-over safety shut-off
• Connects to two 1-lb. cylinders
NOTE: The use of unauthorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty.
For use in Massachusetts or Canada Only. Not for sale in California. Outdoor use only.
Specifications
Model: MH18B
BTU: 18,000
Heating Area: 450 sq. ft.
Weight: 17.1 lbs.
Dimensions: 17.5″W x 11″D x 17″D
Ignition: Piezo
Fuel: Two 1-lb. Propane Cylinders
Run Time: 10.8 hrs. (low), 4.8 hrs. (med), 2.4 hrs. (high)
Before You Order
Verify part number F274806 exactly Match the listed product details to the part you are replacing before ordering. Compare dimensions, specifications and fitment information with your RV or component.
Frequently Asked Questions
What part number should I verify before ordering?
Verify F274806 on your existing part, documentation or equipment label before ordering.
How should I confirm this part fits?
Compare the listed part number, dimensions, specifications and fitment details with your existing component. Do not rely on appearance alone.











