Oh I wish, my washing machine is only cold fill, so have to use electric to heat the water when the washer decides it wants it, not when the sun decides to shine.
Hot fill means you can use water heated by gas, oil, or solar, but cold fill means it uses a full 2 kW to heat water, so unless you have a battery to store solar, it uses power from the grid so costs more to run, so why would you want cold fill only?