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A return line is needed to bring the cold water back to the heater from the faucet to recirculate it through the system keeping all pipes steaming hot. I believe the some of the newer pumps has a temp. sensor built in, so when it reaches a certain temp, pump shuts off leaving hot water throughout the pipe between faucets and heater until it drops to a certain temp., pumps starts up again, another cycle. My system would come on every 15 min for about 20 second keeping the water piping hot. It goes on a little more often during winter but it doesn't get too cold around here. The timer is there so the pump can be completely turned off during a set time such as after midnight to 6 am. to keep wear and tear on the system where hot water isn't needed. Tankless heaters takes an additional 30 -60 second to get water to it source. That's normal. Now, we have hot water in less then 5 seconds.
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