"Andy Hall" wrote in message
...
On Mon, 13 Sep 2004 20:49:42 +0100, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Mon, 13 Sep 2004 16:03:13 +0100, "IMM" wrote:


"Christian McArdle" wrote in
message
.net...
I have also been looking into heat banks and no matter how I
assess,
one large or two small combi boilers comes out the best option all
around for me.

You should remember that a standard heat bank is good for around
40lpm
(at
60C). This is equivalent to 63lpm in combi delta Ts. That would
require
5
cheap instantaneous combi boilers and a commercial gas supply to run
them.

That is nearly true. But most people don't need a commercial setup.
Most
people are content on a bath fill of 5 minutes and a excellent
showers.
A
combi, or combi's, can do that with less hassle in installation and
lower
cost .

Where are you going to find a domestic combi able to deliver 30lpm?

average bath is 100 litres with 2/3 to 3/4 of that hot and thebnrst cold
water. So 70/5 = 14. That is 14 litres/min, which is well short of
ECO-Hometecs 22 litres/min.

No, that's a dribble in the bottom.

Your assumption regarding 2/3 to 3/4 hot to cold ratio assumes spring
to autumn water temperatures. During the winter, the entire combi
output will be needed. At 14lpm and 150 litres - a more realistic
volume for the bath - filling will take over ten minutes.

Firstly 100 litres is typical for a modern bath. Secondly, the Worcester
Bosch Greenstar 40 at 16 litres/min will do. Thridly if you have 150 litres
get it replaced as you are adding to global warming.