These systems are designed so that the pump operates only when there's a demand for hot water, such as opening a faucet or drawing a bath. They're equipped with either a remote switch or a motion detector that triggers the pump to switch ON when movement is detected in the hot water line.
Once activated, the water circulates until it reaches the designated temperature; or the pump is manually switched off; or the timer has expired. Depending on the size of your house, these units typically cost between $400 - $600.
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