Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Portable Propane Radiant Heater. This is an indoor safe propane heater. At 4000 to 9000 BTU it will heat an area well if it is insulated. These are widely available at home improvement stores, check online and local prices for deals. The larger Mr. Heater MH18B, Portable Propane Heater provides up to 18,000 BTU.
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