When I was in Argentina, in winter my residence went down to 55 F. I had a
catalyctic converter which screwed directly on top of a propane tank. It
did not give toxic fumes but burned a lot of oxygen. so I had to leave a
window ajar.
I bought one here in Canada. I tested it. It's easy to install and use.
Really, I never had to use it yet.
Ed Cormier