We have a Wats brand recirculating pump with a built in mechanical timer. We like it very much, we have no regrets, and have recommended them to friends who also added them and like them. We know we are saving lots of water, and also saving $ on our sewer bill, which is calculated on water usage. These only works with hot water heaters with tanks, not with instant hot water systems. Be sure you have an electrical outlet near your hot water heater to plug in the pump. If you don't, you will need to add an outlet, which may require that you hire an electrician. I installed our pump and outlet with a buddy's help. We did not see a noticeable change in our electric bill after we installed our pump. To save energy, I turn off the breaker for our hot water heater and the recirculating pump when we leave town. This requires that I reset the time on the timer when we return home, which is no big deal. I may add a smart outlet so I can control the operation of the pump via the Smart Life App. If I do this, I'll set the pins on the mechanical timer to 'on', so it won't matter if the mechanical timer's clock time is inaccurate.
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