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.

Pros

• If correctly configured, an On-Demand Circulation Pump can reduce the amount of energy your water heater uses.
• Hot water is delivered rapidly when needed. This will significantly reduce the wasted water and the time you wait for the faucet to deliver hot water.
• On homes that have retrofitted their plumbing system with an On Demand Circulation Pump, there will be reduced crossover of hot water into the cold water pipes.
• The ability to override the motion detector and manually activate the pump.

Cons

• On retrofitted plumbing systems it will be necessary to have a power source and a pump at each hot water loop.
• Hot water is delivered quickly, but not instantaneous because the pump will need to be activated.
• The amount of time it takes to deliver hot water depends on your home's plumbing configuration.

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