Most appliances, such as washing machines and dishwashers typically take cold water and heat it internally. This is probably the most efficient way on a grid connected house with electric water heating.
However, I have an offgrid house, and we use LPG (a.k.a. propane) for our water heating. (Others here on Sustainable Living may use solar hot water heating or a wet-back fire etc...). We use photovoltaics for our electricity, but we have to avoid any applications that involve electric heating, as this is a very energy intensive application.
So, my question is:
a) Are modern appliances still available that take a hot water feed?
b) Can modern appliances be connected to the hot water instead of the cold (potentially with a mixer so one could choose a hot or a cold wash)?
Also, does anyone know if internal water heaters be disabled?