I have one of those Infared Propane heaters that attaches to the top of a 20 gallon propane tank. I have only played around with it inside my garage. I got it to put in my boat for winter fishing. But I want to get a milk crate (plastic square thing) to hold the propane tank upright. I don't want the thing to tip over in the boat. So far I have just not fished when it was that cold and have not used it yet. Once I find a plastic milk crate that will hold the propane tank I may give it a whirl. I do know that it puts out a lot of heat and will last for a good day. The one I have only has one burner and it puts heat out to the side. They make another model that has two burners. But the two burner one will go though the propane tank twice as fast. The box that the unit came in is sitting on a shelf in my garage and I can't get to it right now as the boat is in the way. So I can't tell you the BTU's that the thing puts out. I am guessing that it's something like 10,000 BTUS for the single burner. It will definately help warm your hands. I wish I had a bigger boat. It would be nice to be able to put it right behind your seat and have the heat come up around your seat while you are fishing. It won't work if there is a lot of wind though. But on a calmn cold day that might work good. Might want to buy a couple of extra fire extinguishers for the boat and keep them nearby. Just in case the thing tips over or catches something on fire.

I am glad that someone above talked about those coleman heaters. I was wondering if they could be used safely inside a tent in the winter? I have always used those ceramic electric heaters inside my tent or popup camper. With two of them I can put out 3000 BTU of electric heat. That will keep a popup camper toasty warm when it's 40 deg F outside.

Regards,

Moose1am