In message ,
Andy Hall wrote:

On Mon, 15 Mar 2004 23:14:31 GMT, Martin Angove
wrote:

Since dishwashers have some quite hot programmes, why is it that they
usually only have a cold feed? Washing machines rarely come without a
hot feed, why not dishwashers?


There are three main reasons:

1) If you put hot water directly onto anything where a protein is
present e.g. egg or egg containing foods, it will set it onto the item
and make it harder to remove.

I must apologise for causing you to rewrite something you only wrote a
few days ago! I don't know how I missed the other thread - I'd been
looking out for one :-/

Please note that I'm not suggesting, as the other poster did, that a
dishwasher should only fill with hot, but that there should be both hot
and cold feeds available. A washing machine's pre-wash for example, uses
cold, but the main wash might use hot. Does a dishwasher only fill
once, or does it do as a washing machine does and fill several times,
at different temperatures? If I have already heated water I feel a bit
cheated that I have to heat more, particularly if I have gone to the
trouble of lagging the hot supply pipes or installing a HW loop.

If modern detergents are so good in cold water, why do we need hot at
all? Design the darned machines without a heater, or at least without a
programme hotter than 30C.

But (to return to washing machines for a second) I for one would not
feel entirely happy washing my children's nappies at 30C - I *need* that
90C wash :-)

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
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