On Thu, 16 Sep 2004 23:50:29 +0100, "IMM" wrote:


"Andy Hall" wrote in message


To be a bit more accurate:

The formula for resultant temperature of mixing water is

Vc[Tf - Tc] = Vh[Th - Tf]

Where upper case V=volume T=temperature
and lower case h=hot, c=cold and f=final

The store holds 57 litres according to the manufacturer

If the mains water temperature is 5 degrees:

Vc[40 - 5] = 57[60 - 40]

Solving for Vc gives 32 litres and a total of 89litres which is not
enough even for an IMM bath of 100litres. For a reasonable bath of
150 litres It is only jut over half way there and at 11lpm will take a
further 5 minutes or more to fill.

At 10 degrees cold temperature, you could add 38 litres but still you
would be at less than an IMM bath and still at nearly 5 mins to fill
to produce a reasonable bath.

You have clearly never seen a CB50 in action they fill 100 litres baths no
problem, summer and winter.

It's irrelevant. The machine can't defy physics, no matter how much
you would like it o do so. The figures for filling even a
drop-in-the-bottom 100l bath aren't brilliant, and if it's a proper
sized 150l, the performance is pathetic.
THey should either have designed it with a larger store (although then
it wouldn't go on the wall) or a larger burner.

As I say - a linsey-wolsey product.


..andy

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