Hot water on the cold side
Starting recently, when I run the cold water, I get surges of hot water through the cold lines. It seems to only happy when the pump is not running. When the pump kicks in, the water goes cold again...
Forum Discussion
Old-Biscuit wrote:
Do you have an accumulator tank?
W/O one no water could flow without pump on (or city water hooked up)
If you don't have an accumulator tank and you still get more than a half-second of flow when the pump is off, it's possible to have the water heater act as an accumulator tank in some cases if the winterize valves are set incorrectly. In particular, if it's a three-valve setup, having the cold valve open, the bypass valve open, and the hot valve closed will make it a very nice six-gallon pressure tank and let hot and cold water mix more or less arbitrarily. (If you have a three-valve winterization setup, you probably don't have any check valves associated with the water heater.)
Please don't ask how I know this is more than just mere theory.
