"Andy Hall" wrote in message
...
On Fri, 18 Jul 2003 00:30:58 +0100, "IMM" wrote:



Because you are suggesting that a single
box combi solution is the most appropriate
for a DIYer on the basis that it is apparently
simple.

You are getting there. It is simple. And..will
most likely fit the bill.

But doesn't answer the question which
was asked, which was how to go
about designing the complete system.

It does answer the Q. Most of the design is inside the box, done by
experts. The only design is the rad sizing and the pipe run. Not
difficult.

That certainly is not a case of trotting
along to B&Q, buying a combi
boiler, a few radiators and plumbing bits
and sticking it all together
and hoping.

Not hoping. It is not far off what you say. Just a combi with the correct
flowrate and size the rads and buy them.

Radiator and pipework sizing need to
be done properly whichever
solution is chosen.

That is why I said get back to me.

For a combi boiler of sensible capacity
to be useful, it is often necessary to upgrade
the gas supply from the meter - this may be non
trivial.

One pipe run is trivial, when looking at the whole system.

The water main may need to be upgraded,
also non-trivial.

It may not need an upgrade.

If there is existing internal pipework
for hot and cold water, it is
likely to need modification and re-routing
in order for the relative
flows to work reasonably well.
Flow restrictors may need to be
fitted, etc. etc.

It may only require a small modification. Flow restrictors on all taps are
easy and cheap to fit.

A conventional boiler and system
may be more suitable

Maybe, but unlikely.



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