Recirculation pump
Up north, installed a recirculation pump in Master Bathroom. I could set time of day to run. It would pump the "colder hot water" into the cold water line, and thus recirculate. When the sensor in the pump reached the preset temperature it would shut off, and then recycle as necessary to keep water hot. This causes the "cold water" temp to increase, so you are now getting hot water, but your cold water is warm. I like the earlier suggestion of turn on the hot water in my case 42 seconds prior to getting into the shower. Probably waste 2 gallons of water max.
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