On 4 Dec 2005 13:59:01 -0800, wrote:

Ta to Set and Andy for their replies.

Conventional arrangement in the house: hot tank upstairs with
thermostat;
programmable thermostat in hall downstairs; three-port diverter valve
midships in
the house.
The conservatory will be tacked on to a gable wall - the route from the
existing
three-port valve locus to the gable end would be tortuous (not
impossible, but just
outside my "contemplated" range just now! :-)

Mungo

Plan C......


This is a bit more work than SS's plan B and assumes that the boiler
is closer to the conservatory.

Change the diverter valve to 2 two port valves.

Move the pump to a point closer to the boiler - taking account of feed
and vent pipes if an open vented system.

Connect conservatory circuit via zone valve to a point close to the
pump.

If you give this some thought in the initial stages, you might be able
to do a part job to begin with (like you planned) that is easy to
migrate later.



--

..andy