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Feb 11, 2013 at 0:54 comment added geerlingguy It could also be affected by the water temperature coming into the line (if it's much cooler). Incoming water where I live goes up and down 15-20° (F) throughout the winter, depending on the outside temp.
Feb 10, 2013 at 21:21 history answered Niall C. CC BY-SA 3.0