I’ve had several people ask whether it’s possible to connect a cold fill washing machine up to the hot water supply. They were unhappy about the disappearance of the hot water valve in UK washing machines.
Many people who are using solar powered energy to heat their water, or who had another cheapor environmentally friendly supply felt that the advantages of their environmentally friendly and economical hot water will be wasted by not utilising their hot water supply.
The answer to the question is no, for the following reasons -
- The incoming water temperature could be too hot to start with (usually at least 60 degrees Centigrade), which can damage delicate laundry and shrink woollens
- The initial wash water is likely to be far too high for most commonly used wash programmes which only need 30 or 40 degrees, so the washing machine would move on to the rinsing too soon – compromising the wash quality
- The enzymes in biological detergent are killed off at the temperature of most people’s hot water so efficiency of biological detergents would be compromised
- Biological detergents are said to be more effective when starting in cold water with the water gradually heating up.
- The laundry would be rinsed in hot water which isn’t as effective as cold, and could cause severe creasing as well as wasting all the hot water
A full explanation as to why almost every washing machine is cold fill these days is here – Pros and cons of hot and cold fill verses cold fill washers