Quote:
Originally Posted by red-beard
My BOSCH dishwasher heats the water. But it uses electricity whereas my regular hot water is gas/solar. So yes, run the faucet to get the water hot first.
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Being that dishwashers use very little volume of water, and running the hot water until the feed pipes are hot
can use quite a lot... I expect that for most, that the price of electrically heating (at the dishwasher) is more efficient than running a much larger volume of gas-heated water. YMMV, but around here cheap hydro-E (at 8.53¢/kWh) is typically the same price as gas.
Also, by using self heating appliances the thermostat on the HW tank/heater can be turned down, giving even more power savings.