From Robin Thompson
Brian Wootton need not wait for washing machine manufacturers to go back to producing dual-inlet goods to make the most of his solar water-heater panels (12 September, p 27). I know of no important part of the washing machine cycle that demands cold water. If he has a source of free, or very cheap, warm water he can simply connect it to the single inlet on the machine.
Little Bookham Common, Surrey, UK
