On 01/12/2020 11:49, HVS wrote:

You seem to be confusing the terms "cold fill" and "cold wash": the
machine will heat the cold-fill water when you set it for a hot wash.

Not really confusing the issues. I was pointing out that a modern
machine doesn't need to do a boil wash to remove certain contaminants
from clothes and that the temperature of the water possibly plays a
lesser part in the total washing process.


Irrespective of the final temperature of the water and/or the selected
program the wash will start with a cold wash with detergent to try and
remove common stains that may be cooked in if hotter water is first
used. With this initial cold wash the machine has enough water to
complete the wash. It doesn't discard this water or detergent for the
rest of the wash - it just heats the water, if required. There is no
point at which a hot feed would be used on a modern machine.


Given the reduced amount of water used by modern washing machines and
the distance in most houses between the HW tank and the washing
machine, most of the "hot fill" will be what's currently sitting in
the pipes, and the machine will have to heat it up anyway if you're
going to run a hot wash.


Especially as modern machines are also designed to use a lot less water
than their counter parts of yesteryear. The last machine I've owned that
had a (working) hot feed was 30 years ago!


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