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[yotehunter66]

How  much heat loss is contributed to uninsulated lines running through the basement and from natural convection from the heat exchanger in the furnace when the blower is not running? I measure my temp at the pump inlet and at the point where it first enters my basement to determine heat lost from the underground pipe.

[mlappin]

Best way to tell would be to get some shark bite fittings with the gauges in them and place em both right at the wall. Of course no two gauges are going to read identical.