I thought about getting one but changed my mind after talking to someone at Watts. The waste gets pushed back into the hot water line. So, when you want hot water, what do you do? Turn on the tap and wait for it to get hot. There goes the water you saved. Also, when you aren't using the hot water eventually the water gets pushed all the way to your hot water tank and beyond. There goes the hot water you just paid to heat. You're not really saving any water in the end and in the long run you will lose money in heating water that is pushed back out of the water heater.
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