Integrate water circulation pump with Alexa to guarantee shut off in 10 minutes
I have a return water circulation pump installed on my hot water lines and I use a timer to turn the pump on during the day and off at night. The pump I used is the smallest B&amp;G pump I could buy. It is a  model NBF-8S/LW--103257LF that uses only 39 watts of power. Very little electricity is used by the pimp and very little extra nat gas is consumed when the pump is running. I had a short wire with a plug installed on the pump and I plug it into a cheap manual timer that I set to come on at 6am and shut off at 10pm. I plug the timer into a receptacle and plug the pump into the timer. This has worked for me for 20+ years. By the way you only need a very small pump, that is stainless steel or bronze since iron pumps get ruined by domestic water. As far as using Alexa, that is okay if you can remember to ask it each time. However you can't beat the cheap timer price.