hey y'all, I just got the smallest Regency (F1100) and am running about 5 1/2 feet of dbl. walled stovepipe......as an early Xmas gift my wife gave me a Homesaver magnetic stack thermometer (it was about $15). However it is designed to be used with single wall pipe, so I'm wondering what would the optimum temperature range be as a result of the dbl. wall pipe?Is there a formula (like add/subtract "X" degrees ) to determine it? I've been burning small-to-moderate fires as suggested for the first few days (this is day 4) and the readings are in the 125-150 range.......any info will be greatly appreciated, and since I'm a new-to-the- forum-guy here, I'm now looking forward to reading all these posts as I await a reply.......thanks, CB P.S. to my local natural gas company, I say "bite me" !