On Jun 27, 7:46 pm, "Roger Mills" wrote:
In an earlier contribution to this discussion,
The Natural Philosopher wrote:



If I had my time again I'd zone every single room. With a motorised
valve, and run a ****load of cables back to the timer and pumps etc.

We have a lot of rooms we don't use all the time, and it would be far
more economical to simply flick a switch and have them go to 'frost
stat' settings when not in use.

It would certainly be nice to have an S++++ system, with a programmable stat
in every room - so as to be able to heat each room only when needed. You
could probably do it without too much plumbing by using (don't know the
correct description) things like TRVs with little heaters in them to turn
individual rads on and off by remote control. Would need a lot of wiring
though, and I don't know whether these things have secondary contacts which
close when the valve is open - like a proper 2-port zone valve.

Such a system would be a nightmare to programme though unless your room
usage followed a very regular pattern. Even then, you'd have to tell each
individual stat about things like going on holiday for X days. Really needs
to be programmable from a single point - with the ability to apply global
settings to all stats in one go - but I'm not sure how to go about that. I
don't really want to run a dedicated PC *just* the operate the heating!
--
Cheers,
Roger
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I'm looking at doing exactly that in a project - using actuator
valves and individual room stats. It's not that hard - an actuator on
every radiator instead of a TRV. Each one links to a thermostat in the
room and all the stats link down to a wiring box. I'll then use a
central controller from http://www.heatmisershop.co.uk/
Heatmiser_MC__Colour_TouchPad-p-16143.html (their stats look good
too, but I'll use different actuators. The ones for under floor
heating work - they fit onto a TRV body)

Looks like an ideal system. It's not that cheap, but the plumbing is
done as a single zone, so there is a saving there, and the wiring is
simple enough. Can be done wirelessly, but that puts the price up.

A