HughM
We put ours in about 2 years ago, and use it a lot, for the heat. We have been on our trip south, for about one month and we just used the first bottle of propane.
The one we have is model #D3F252 at 1375 watts. The box is 23 3/8 wide, it cost a little under $300.00 at Lowes. Here is a pic of it.