Nick Atty wrote:

Of course, all this is for an additional radiator. I'm not planning
to
remove the exisitng one, rather I was thinking of setting its TRV to
a
lower level than the new one. So when the system first come on both
run
at first to get up to temperature, but overnight only the new one
will
run to keep the room up to temperature (this is the room with the
thermostat for the upstairs zone in).

Many thanks to all for your thoughts. I see I can get 30cm high
radiators from stelrad at up to 3m long (the high output version of
which is 3Kw - a lot more than my pipework suggestion would even have
delivered). So seeing if I can mount one of those on slightly
longer
brackets is my current thinking. Truely several heads are better
than
one.

I imagine a much neater result can be got by snaking microbore under
the floorboards as simple ufh. Fit service valve to keep the flow rate
down so temp doesnt get too high; would that work?

I was originally going to sugges that adding a small silent low rev fan
can substantially improve a rad's output, but it looks like you've got
it all worked out.


NT