Thanks for the encouragement welder19, haven't given up just yet; just mulling things around some more. Where i come from theres' two counts to answer at this point, 1. I am manufacturing an uncertified appliance (forge) and 2. will my insurance company still give me house coverage if something happens? I've witnessed a couple of instant combustions, one was 3,000,000 Btu boiler burp and shake a ten storey building. We had to replace a chimney top for a 18" ten storey chimney an some splannin to the local fire dept. There was a fault in a new boiler and we had to have it go through its sequence to find the fault. The foreman and I were sitting astride it at the time. any way the point was I have waltzed with gas before. Thats why I am asking lots of questions and checking tables. What pressure do you run your LP gas on and what size burner oriface? Thanks ...........Duck