In article , Mike Barnard
writes
On Fri, 29 Jun 2007 19:04:15 GMT, fred wrote:

Sorry for the delayed reply.

Understanding is OK, it's just the working it out to start with. So I
could use either the bathroom or bedroom 2 as the primary room as
they're both north facing and they are very cold rooms.

Bathroom:
Gets visited most often.
Gets wet morning and night.

Bedroom:
5yo Sons room.
Out of use 95% of day.

In this case I'd probably run the bathroom off the live backbone so that it
comes on whenever the boiler fires ie any heating or hot water demand.
Use a TRV to limit the temperature and turn it off completely in summer as
required. Although it doesn't appear to make sense to control from your
young son's room, if that is the cold side of the house then it is probably
the way to go (for the upstairs)

I presume part P precludes the controls from being bathroom based.
Shame.

Even if it doesn't, it's unlikely they'd last long in a humid environment. The
ones I have looked at preclude that kind of placement.
--
fred
Plusnet - I hope you like vanilla