"David Hansen" wrote in message
...
On Fri, 10 Mar 2006 13:00:40 GMT someone who may be Guy King
wrote this:-

The trouble is they draw water from hot /and/ cold when hot is required
- for two reasons. 1) There may be no hot water connected 2) The hot
water may be too hot.

This could easily be solved with more complicated controls, which
would measure water temperatures. They would then use as much hot
water as possible, only adding cold if the hot was too hot for the
programme selected. No doubt manufacturers think this would cost too
much.

Equalising the pressure on the hot and cold sides, by feeding them
from the same source, can also reduce the enthusiasm of the cold
water.

A neighbour saw that on a 50C wash hot an cold came in and mixed making the
50C tap water about 30C, then the electric element cut in to heat the water
to 50C. She realised that at the very hot wash (90C?) only hot ever came
through and the cold was off. So she made sure hot water was at the tap,
selected the 90C wash and the drum filled with 50C water, then she would
switch off and then select the 50C wash. It worked, also the wash was
quicker.