Mr. Heater Portable Big Buddy Propane Heater with 10-Feet Propane Hose Assembly and Propane Tank Refill Adapter Bundle… Price: $92.37 (as of 21/03/2022 00:06 PST- Details)

4,000- to 9,000-BTU radiant heater for spaces up to 225 square feet. Approved for indoor/outdoor use; clean-burning; nearly 100-percent efficient
When operating the heater at altitudes over 7,000 FT above sea level the heater may shut off.
Auto shut-off if tipped over, if pilot light goes out, or if detects low oxygen levels