Do not recommend the Cal o Rex, we have had nothing but trouble with ours, had a couple of people over to fix it, noisy as can be and we have to light it before use or it does not get hot, if left on for a long time.
Had a friend with the same heater and his would drain his gas tank, he had I don't know how many people out to work on it, and he ended getting a different kind and works fine now.