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Hi Folks,
Just mumbling out loud here to see what others think:

Our builder has (unusually?) told us that he's happy to erect our new
conservatory
over the Christmas holiday period, providing that the brickwork can of
course be
put in place by then.

This has caused me to think seriously about heating the new space. I've
never owned
a conservatory before, so it's all new to me.

Present proposition is to add three wall radiators to the dwarf-walled
conservatory
and run these off my mains gas wet central heating system.

Being careful with the pennies, I was thinking of adding a two-port
valve to the feed
for these radiators, and then controlling this valve from (say) some
sort of timer
such as an immersion-heater-booster device as per shown on the TLC web
site
he

http://www.tlc-direct.co.uk/Main_Ind...ersion_Heater_
Timers_2/index.html

Prior to using the space, I merely press the button for (say) a
two-hour duration and this
opens the valve for that time.
I'll leave the house stat to decide whether the boiler needs fired, and
also I'll add
Thermostatic Radiator Valves to the three radiators too.

Of course, this arrangement does not guarantee that the boiler will
fire when the
conservatory needs it, but I'm hoping that that will not be a problem
(fingers crossed;
this is where your opinion is sought).

Instead of fancy Frost Stats I was thinking of adding an electric panel
radiator to
the conservatory whose thermostat is set quite low.
Thus when the outside temperature plummets and there is a risk of the
conservatory
radiators freezing, the electric panel cuts in and lifts the
temperature to avoid this.

Perhaps another immersion-heater-booster switch could be wired to
override the
thermostat to kick the electric panel in if required.

Any problems with my scheme?

Any source of an electric-booster switch with more flexibility than
that shown on
the TLC site?

Advice requested; thanks in advance.

Mungo

Don't put rads in. Install a dedicated Myson fan convector heater.
http://www.myson.co.uk/hiline.htm
http://www.myson.co.uk/slimline.htm

You probably could take this off the rad circuit. You may want to fit a pump
with non-return valve in front of the pump, just for the unit to get the
flow. Have an external stat which switches on the fan and pump.

This is far better than rads.