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Hello, I have a 12 cubic foot updraft gas kiln, with 4 burners made by Contemporary Kilns about a hundred years ago...or at least 30. At any rate, I successfully fired this kiln with propane for the past 25 years that I have had it. Now being in the city, I am having to switch to natural gas. I talked to my local furnace supplier, and they contacted Ward Burners- found out that my propane orifices were size 50, and that I needed size 39 for natural gas. So they ordered them for me. I have installed them, explained to the gas company all the specifics of the burners- (80,000 BTUs / burner) and had a plumber come and put in gas line and regulators etc. So today we fired it up for the first time with natural gas... hmmm...very colorless flames that seemed bland. I used to only have the gas valve open just a bit with the propane, yet it was half open with the natural gas and still seemed not very serious... Ideas? Input? what am I doing wrong? Thank you for any ideas! Pat