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That was installed over 10 years ago. There's a thermo switch that's attached to the hot returning water line. Once it drops below a certain temp, especially in the winter months, it will kick on the pump. Since it doesn't get that cold here, it will runs for about 20 seconds, about 15 times per hour. I had a timer hooked up to it, but removed it because I realized it was running so little during the night. I pulled it to keep having too much crap there.
A return pipe is needed from various locations or the furthest point from the heater. Check valves are needed to keep water from entering back into pipes where you need to keep hot water out. Check valves do go bad over time due to hard water.
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