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Best I can tell I'm loosing 20℉ on my house loop with the furnace not running and my hot water heater up to temp, approximately 220' underground and 30' in the house. I bought 2 digital meat thermometers and suck them under foam pipe wrap on the in and out in the back of my boiler they read almost exactly 20℉ different. It's 65℉ outside now. I'm ready to pull my hair out. How else can I test temp loss?
I would use a candy thermometer (or one that can take the high heat) drain some water at the feed line on the back of the stove and do the same at the return line at the stove. drain the water into something you can put the thermometer in and read the differencethe loss you are reporting would equate to about a whole years heat in an average home, if we figured you were only moving 5gpm