CraigB wrote:


The current boiler is a condensing one I believe (as I've found a
condensate trap) and I was - it seems wrongly - assuming that the 40CDi
I was being recommended was a direct replacement suitable for extending
the capacity of the whole system. Happy to be advised otherwise.

The first thing to do would be to work out if you have a problem. If not
it may be better to not fix it until you do have one.

Looks like I need to do a bit more analysis/reading (never had to buy
or fix a CH system before!)

Try the boiler choice FAQ

http://www.makewrite.demon.co.uk/BoilerChoice.html

And the sealed system one:

http://www.makewrite.demon.co.uk/SealedCH.html

--
Cheers,

John.

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