I have a tankless system and I got tired of waiting ~85 seconds for hot water to get to the shower head. I installed a circulating pump with crossover at the farthest sink. Plugged it into an Alexa enabled outlet and programmed it to run for 5 minutes and then shut off. Prior to taking a shower, we simply say, “Alexa pre-heat water” and head the bathroom. Pump turns on, fires the burner, heats water, circulates for 5 minutes and shuts off while I am in the shower. Hot water arrives at the shower head in 25 seconds. Would be quicker if the main run were closer to the shower.
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