I have a Hot Dawg in my 20&25 shop with nine foot ceilings. They are a great unit the heat blows down on the floor. It works great. For the Garage your talking a model HD45 is what you want the bigger one is to Large. I sell these things on my day job. I took one back from a guy because it was...
I have a Hot Dawg 45000 btu and love it. I ran the gas line on the finished wall black iron pipe. It looks nice and I can access if needed. For a shop I wouldn't bury it in the wall. Mike
Gas water heater sold in the USA for the last couple years have a more sealed combustion chamber to help prevent the problem your concerned about. When you look at one it will have a red button to ignite the pilot you can no longer lite them with a match etc. They also make a w/h that is totally...
The line that runs past the building is a high pressure line your gas company will install a secound stage regulator on the building from there to the heater. If you want to run it off the 20 lb tank toss the hose and use half inch copper
to the black pipe and if you can get a large twinstage...
I would use a Modine Hot Dawg 65000 btu propane heater. You can look them up on the web. I have a 45000 btu but my shop is smaller. They should have no effect on your insurance because they are made for shops. I leave my shop at 50 degrees and it will come up to temp when I'm out there
Mike