On Wed, 12 Jan 2005 01:46:39 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Wed, 12 Jan 2005 01:02:15 -0000, "IMM" wrote:

For no lag and 18 litre/min flowrates also see
the Alpha CD50 condensing storage combi:
http://www.alpha-boilers.co.uk/products/CD50.html

"The Alpha CD50 condensing storage combi is designed to satisfy the hot
water and heating requirements of the larger home whilst reducing energy
consumption. When the store is fully charged an equivalent domestic hot
water output of 50kW gives a flow rate of up to 18 litres per minute at
approx 55C - 60C, enough to fill an average bath in about 3 to 5
minutes."

There is marketing-speak in this:

- The specification doesn't say what an average bath is.

The avergage bath is now 80-100 litres.

Really? Have you measured one lately? That volume is a paltry
amount in the bottom of a standard sized bath. If it seems like a
lot to you then perhaps Archimedes principle could be at work?

It wouldn't be adequate for any female I know.......


This will fill an avarage bath in
minutes and never run out of hot water at any time.

This is the marketing claim. They neatly sidestep any obvious
references to wat the rate is when the small store runs out.

3 minutes to recover
the water store.

Which is a separate issue and again presenting something in the most
favourable light rather than the reality of what happens when the
small store empties. They aren't even honest enough to give the
figures because they are embarassing.




- The maximum output rate to hot
water is 32kW implying max of 13lpm
once the small store runs out.

It is a condenser, so more towards 14 litres/min.

It being a condensing boiler or not is irrelevant to this. The heat
output to water heating determines the flow rate at the specified
temperature rise. Whether or not it's a condensing boiler only
impacts how much energy is going in for that.

You have to dig beyond the marketing hype and look at the hard numbers
to determine what is really going on.

As soon as I see a manufacturer obfuscating data like this and just
presenting a rosy view, my thought is what else are they obfuscating
and I look elsewhere.




--

..andy

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