"Set Square" wrote in message
...
In an earlier contribution to this discussion,
IMM wrote:

To DIY go combi. they are a doddle to fit and are quicker too. It
will modulate down to the heating needs of the small house. No
complex zone vales or control wiring, etc.

Here we go again - the answer's a Combi - now, what's the question!!!

The OP specifically said that he wanted to keep stored hot water for his
venturi shower - not to mention baths! So, if he goes the combi route,
he'll
need to use the CH side for most of his requirements, and use zone valves
to
split CH from stored hot water.

It is the bottom line that counts. A combi and buying a new thermostatic
shower mixer will give great performance and be cost effective to him, as he
is fitting it himself.

Please at least try to use some common sense.