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Posted by Gary on October 20, 2008 at 00:34:51:
In Reply to: Weil McLain Ultra Oil UO-3 - Boiler Data Analysis posted by Rob on January 31, 2008 at 02:40:20:
-40c = -40f = extremely cold. Not just cold but arctic circle cold. Maybe some place way up at the top of the continental US or Alaska. Otherwise the average outdoor temperature is probably higher than 30f = 0c