Mr. Heater F232025 MH9BX Buddy 4,000-9,000-BTU Portable Radiant Heater, California Only 4.7 out of 5 stars 291 Mr. Heater Optional 6Volt Power Adapter for Big Buddy HeaterThe MH9B little buddy is a 4,000-9,000-BTU portable, indoor safe radiant heater. A single 4,000 heat setting delivers sufficient radiant heat for a space up to 200-square-feet. Safety features include a tip over switch that will shut the heater off if it gets knocked over and a low oxygen sensor that shuts the heater off when oxygen levels in the room get too low. Free Shipping This product qualifies for free shipping. Mouse over to zoom-Click to enlarge. 11,000 BTU Max Output Omni-directional Mesh Burner, Updated design featuring optimized Dec 31, 2020 · Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater | Best Trailer Heater Finally we have a rather reliable and state-of-the-art heater here. We can’t call it a purely automobile gadget though, as it is powered by… a small propane tank.