I put one in and after seeing how much heated water was circulating even with using the timer, I installed a wind up timer to turn on the pump whenever we want hot water. The timer came from Lowes and cost about $20. It's the one that winds up with a 60 minute time limit. Actually, we only wind it up about 15 minutes before showering or running the dishwasher. When the timer times out, it shuts off the pump. You will continue to have hot water as long as it is running. Oh, the pump was $149 at Amazon. I got the WATTS pump. Anyone handy with a small plumbing project can install it.
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