Mr. Heater Big Buddy 4,000-18,000 BTU 3 Setting Portable LP Gas Heater Unit

We own a remote cabin in the Colorado high country. I own two of these which I use to heat the cabin when we first arrive to supplement the furnace. When it is 10 degrees outside I can heat the cabin from 40 degrees to 68 degrees in two hours using the heaters, furnace, and gas fireplace. Once it's 68 I shut off the portable heaters and use the furnace and gas fireplace to maintain heat.

it's the 2nd one I've bought. I use it to heat my houseboat, and in the dead of winter, like today, it's 12°F -1°F with the wind-chill! I have it on low and I'm in a T-shirt, comfortable as can be! It's very simple to start, just turn a knob basically. Very safe as well! I'm amazed how it produces really good heat, unless you or something flammable is directly in front or above it, it's no worry! I can put my hand below, behind, either side, even above the 2nd heating element, which only lights on high, I can leave it there for however long, but 2 inches to the left it'll burn my hand! That's great for using in smaller spaces like boating or camping!