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My gas kiln is powered by two venturi burners, of uncertain specification and unknown origin. I have a feeling that they are more than a little inefficient, and in any case are sometimes very finicky to use. I also suspect that they are over-powered for the size of kiln I have. It may be that they could be re-jetted, or something, but to be honest I'd rather just get some modern burners. So, before I buy some new burners, I'd like to be sure I'm getting the correct specification. The kiln is a traditionally designed down-draft, more or less cubic in shape, with a sprung arch. The overall interior volume is 20 cubic feet. The burners fire horizontally into minimally bag-walled fireboxes, from diametrically opposite corners. Gas is bottled propane. The walls of the kiln are 4-inch thick soft IFBs, with a further 2 inch layer of ceramic fibre on the outside. Chimney is a little over 12 feet. The maximum performance required from the kiln is to fire to cone 6 in 8 hours (less would be good). Often, I'm only firing earthenware to cone 03. According to what I can find, the kiln theoretically requires 200,000 Btu per hour, so 2 x 100,000 Btu burners should be about right. Any kiln gurus out there who can tell me if I'm about right in my findings? I'd like to get it right! Many thanks!