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Generally, a maximum of 10metres of pipe run is OK. Anything over that should be recirculated back to the hot water heater (via pump) for re-heating so that the system forms a loop. Apart from the loss of water as you wait for the hot water to come out of the tap, the longer the pipe run, the lower the temperature of the water in the pipe becomes between uses. This can lead to low hot water temperatures where bacteria such as Legionella can grow in the water.

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