Yes, we've often discussed that. However, in that case I think it's as much a case of the hot feed being 'useless' as of it being wasteful of energy, since the machines now use so little water that, even with a 'hot feed', little if any hot water would ever get into the machine unless the pipe runs were very short!
Depends how hot, I worked out by looking at the meters that our shower, possibly in summer, was using more for water (0.2p per litre) then the gas.
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