Mr. Heater Big Buddy PRO 18,000 BTU Portable Propane Heater — Dual Radiant & Convection with Fan

Built for campers, ice anglers, garage projects and chilly porches, the Big Buddy PRO blends powerful heat output with safety features and convenient setup. Its dual heating system combines radiant warmth with convection airflow so a small space heats quickly and stays comfortable. The unit accepts two 1 lb. cylinders or can be adapted to a 20 lb. tank with optional accessories, and the built-in fan improves heat distribution when you need it.

How does the Big Buddy PRO keep a space warm efficiently?

The heater offers three flame settings—Low, Medium, and High—so you can control output from 4,000 to 18,000 BTU depending on the situation. Its radiant element warms surfaces and people directly, while convection moves warmer air across the area for more even comfort.

• Three heat settings: 4,000 / 9,000 / 18,000 BTU for precise control
• Dual heating: radiant plus convection for direct and ambient warmth
• Built-in high-powered fan enhances circulation on demand

What power sources and run-times can I expect?

The Big Buddy PRO ships to work with two 1 lb. propane cylinders screwed on with swivel regulators for fast setup. For longer sessions, use the optional hose and connect to a 20 lb. tank; at low setting the heater offers exceptional fuel economy.

• Accepts two 1 lb. cylinders for portable operation
• Compatible with 20 lb. tanks using optional hose and adapter accessories
• Up to 216 hours runtime on two 20 lb. tanks at low setting (with optional hose)

What safety features are included for indoor or semi-enclosed spaces?

Safety is built into the design with a Life Safety System that monitors oxygen levels and unit orientation. Multiple automatic shutoffs reduce risk if oxygen drops, the unit overheats, or it gets tipped over.

• Oxygen depletion sensor (ODS) monitors air safety
• Thermal shut-down prevents overheating
• Tip-over switch cuts fuel if the heater is knocked down

How easy is setup, transport and maintenance?

Swivel regulators allow quick attachment of propane cylinders while the integrated handle and compact footprint make it simple to move and store. Routine care is minimal — keep vents clear and follow manufacturer guidance for authorized accessories.

• Swivel regulators for fast cylinder changes and secure connection
• Compact, portable design with carrying handle for transport
• Simple upkeep: clear grilles and use only authorized accessories to preserve warranty

Who is this for: The Mr. Heater 18,000 BTU Big Buddy PRO is ideal for people who need dependable, portable heat for small to medium spaces — campers, ice-fishing shelters, workshops, backyard gatherings and emergency preparedness kits. It suits users who want multiple heat settings, long-run options with larger tanks, and built-in safety systems for occasional indoor or covered-space use. Follow all local ventilation and safety guidelines when operating in semi-enclosed areas.