I want programmable thermostat to control a Mixer Valve.

[Barley31]

I want programmable thermostat to control a Mixer Valve. This to provide CH flow temperature from 30C to 70C from a thermal store tank at 80C

 

[siricosm]

Not sure what you want to do, but if your rads have TRVs, you probably would be better off with programmable TRVs on all the rads, a modulating pump and no house thermostat. Central heating control with a thermal store doesn't get any better than that.

You might get more answers in the central heating forum.