In an earlier contribution to this discussion,
Paul wrote:

Can I ask about heating for an extension to be built? I live in a
modern house with GCH. We're extending which I guess will increase
the floor area of the house by 25-30%. We've been chatting to someone
who's done similar about the heating. He has used modern storage
heaters (Dimplex Duoheat) in his extension. He feels these are
fantastic but the main reason he did this was that he was worried
about extending his microbore central heating system. He had heard
that if you extend a microbore piped GCH system too much, you can
develop problems with balancing the system etc.
I like the look of these new storage heaters - but before I take the
plunge, any opinions on this as an option rather than extending the
GCH system? TIA, Paul

Under no circumstances would I allow electric storage heaters anywhere near
my house! Not only are they expensive to run (even off-peak electricity is
dearer than gas) but they're also a nightmare to control - giving out heat
when you don't want it, and vice versa. The latest models are better than
their predecessors - but still not very good!

Assuming that you have adequate boiler capacity to heat the extension, it
would be a good idea to extend the main flow circuit into the extension in
22mm pipe - just using micro-bore for the final drop to each radiator. That
would be far better than having long runs in microbore.
--
Cheers,
Set Square
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