"Andy Hall" wrote in message
...
On Mon, 6 Sep 2004 00:14:08 +0100, "IMM" wrote:


"Andy Hall" wrote in message


If you segment the heatbank into two and deliberately run the lower
half at a lower operating temperature, you are cutting into the
storage for the DHW application. This implies either a larger or a
separate heatbank to do the job.

A taller heat bank that's all.

In order to achieve your solution, we are at a 300 litre minimum
heatbank.

From somebody who normally
makes such a huge issue about airing
cupboard space as a justification for
combis, this is hilarious.

If you have a cylinder taking a foot higher is no big deal. It can always go
in the loft.

This is why it is far better to treat the CH and the DHW as the two
totally different systems that they are in terms of thermal
characteristics and time constants and to simply drive the radiators
from the modulating boiler.

Not cheap to do this.

Of course it is.

It isn't. When installing a heat bank you may as well take advantage of
what it can offer. A simple boiler and a weather compensator transforms it,
and very cheaply too.

What tripe. Stop making things up.

Go and do some reading on control
systems and condensing boiler
technology - none of these are
complicated concepts for most people.

Unfortunately you have only read about these. As you lack focus with a poor
attention span the results will be skewed.