Apart from the cost of the energy, I always felt it much more efficient to heat the water in the WM. No storage or pipework losses, though it would take a bit longer. The HW pipe starts cold which isn't required and is left hot, ditto!
Most machines get nearly all cold anyway when they open both valves; it's usually only the cottons wash which takes hw alone. I may beout of date here, perhaps they're cleverer now.
60 degree and above is hot fill only.
but the incoming h/w dissolves the detergent thats why they use hot, although i have to agree on inital fill the hot will be cold warm at best
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