In message , John
writes
I should have asked the installer but he's now away on holiday (

Anyway, just had an Alpha boiler installed (CD32C) and wireless room
stat/programmer/timer thingy. The boiler itself has a thermostat numbered
0-9,

That's a temperature control - when the water temperature reaches the
temperature you have set it to, it will turn the gas valve off

there's the room stat,

Which will turn the boiler off when the room temp reaches the set
temperature


and then all the rads except one have
thermostatic valves.

Which will prevent water going through that particular rad when the head
if the TRV reaches the set temp

Which thermostat takes priority and what should the one
on the boiler be set at?

None, they are all doing different things

so, for example, set the boiler ctrl high and the rads will heat up
faster because the water temp is hotter and then either the TRV will cut
the water to the rad or the room stat will cut the boiler

Really your room stat is redundant if you are going to use the TRVs


--
geoff