What I don't understand with these modern washers is why you can only buy cold water feed machines now.I know what you mean, but in terms of environmental impact you are probably better off with a modern machine that uses much less water and electricity.
If you have hot water ready to use either from a tank or combi boiler - why is it more efficient to heat water in the washing machine?
I may be missing the point somewhere but it doesn't make sense to me