Thanks for that, we do have 15mm pipes and this rad (downstairs
frontmost room, furthest away from boiler) doesnt have any other
radiator after it.

Hopefully it wont involve the complete draining of the system....but I
will expect the worse

Any idea how long it *should* take if a drain, refill (and additive
readded) would take?

Ive been warned of a £200 plumbing for this as its a days work????

Thanks


Looking at ny Stelrad brochure, a 700x1800 P+ has a rated capacity of 11,993
BTU/Hr (3.5kW). That is for a Delta T of 60 degC so, if your Delta T
(difference between room temperature and mean rad temperature) is 55 degC
(more likely than 60), you'll need to downgrade the rated value by about
10% - bringing it down to about 10,800 BTU/Hr.

[The P+ is a double radiator with one lot of fins between the sections. If
you need even more heat, a K2 of the same size (which has double fins) has a
rated capacity of 15,373 BTU/Hr - or about 13,800 when downrated]

If you do increase the radiator capacity, you'll need to make sure that the
pipework is adequate. It generally reckoned that 15mm pipe will support 6kW
of heating capacity. The above mentioned K2 is 4.5kW - so you wouldn't want
much else sharing the same pipes.

If you fit a larger radiator in essentially the same position as the
existing one, it probably wouldn't take a plumber all that long to fit. He
*may* be able to do it without draining down if he freezes, shortens and
caps off the existing pipes and then extends them again when the new rad is
in place.
--
Cheers,
Roger
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