"Christian McArdle" wrote in message
t...
The boiler does not...eventually there is just one super hot
bathroom, and the pipes going to it, and the boiler occasionally
firing up to keep it that way.

It is against the building regulations to install such a system. It keeps
the bathroom too hot and the central heating pipes hot when they could be
cold. Central heating pipes do lose a lot of heat.

You CAN balance everything and hope that the heat losses stay teh same,
and the master stat will do everything right, but its a darned sight
cheaper to TRV everything, so you can turn down certain rooms when not in
use.

You can TRV every room except the room thermostat one. Balance the system
properly and then turn down the room thermostat room half a turn. This
ensures that other rooms warm up quicker and the TRVs shut off before the
room thermostat is satisfied. Then, when this happens, the boiler
interlock
cuts in, preventing the central heating pipes being kept warm for no
reason,
which can be very wasteful, particularly on a marginal day when heating is
only really required in the morning and late evening, but is selected on
all
day.


Sounds right to me. So as a compromise, how about putting a wireless stat in
the conservatory and replacing the stat in the hall with a TRV on the hall
radiator? The timer would ensure that you're not trying to heat the
conservatory all the time. And you might need to set the conservatory stat
down a bit lower than you'd have set it were it still in the hall. Seems to
me it would be easier than rejigging the CH to add an additional zone, and
avoid having the system running all the time.

Just my 2p

Cheers
Clive