It pays when building a house to install the HWC centrally to the serviced outlets or closest to the areas of highest usage, eg bathroom, laundry. In out house however the distance to the kitchen is a 20 meters pipe run, with unacceptable delay and hot water wastage. I installed a smaller water heater directly under the floor below the kitchen sink, now the delay is 1 second, so it must pay for itself over time. Another solution would be use install instantaneous heaters, so initially they supply the hot water then turn off as the heated water arrives from the main HWC.
Mike
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