I'm not so sure about the last point.
Apparently, with modern machines hot and cold fill are a waste of time because the machines use so little water.
In many cases, by the time the demand boiler has got up to temperature or the water had travelled the length of the pipe from an upstairs immersion heater the machine has finished filling. A modern machine will only use a few litres of water.
You end up heating the boiler and pipework, but not the water in the washing machine.
Graham