Please don't quarrel with me if you don't agree Gransnetters, what follows is just what I've read over the years:
I've always understood that a dishwasher is actually cheaper to use than washing by hand - always assuming that you don't count the cost of the machine in the first place. Apparently the cost of heating the water tank, then running the water until it is hot (at least twice) is more than filling the machine and just heating the water you use. More modern machines have heat exchangers that absorb the heat from the washing and rinsing water to help with the drying.
In our house we have cheap power at night (whatever they now call the old Economy 7) and the machine is timed to run then, using any hot water than remains in the system rather than using cold water.
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