Thanks, I thought that might be one of the options and probably better as its a combi anyway. When using two programable stats i presume each one would be wired to a valve and then to the boiler. How would the wiring at the boiler end be done?
How do you get hot water? If you have a combi boiler, you will only need a two channel device; but if you have a hot water cylinder, you will need either a three channel device or a two channel for the heating and one channel for the Hot water.
I think the second option (two channel heat and separate HW timer) is better as the HW device can be a very simple time switch, with say two on/off periods a day and an override button, which can be installed in the airing cupboard with the HW cylinder. You do not need the sophistication of a Central heating programmer. A Honeywell ST9100A or ST9100C would be suitable.
Honeywell have a new two-channel programmer specifically designed for two heating zones (most two channel programmers are for heating and hot water).
Honeywell ST9500
The ST9500 is a 7 day two zone programmer designed for individual control of two heating zones and feature the LoT™ display, it also offers up to three "on" periods per day. Additionally each day may be programmed differently.
The thermostats you mention will, of course, have to be wired back to the programmer. Make sure you use digital thermostats e.g Honeywell DT200; they give better control over the temperature.
The alternative is to go the wireless route (for CH only).
When using two programmable stats, I presume each one would be wired to a valve and then to the boiler. How would the wiring at the boiler end be done?
That will depend on whether the boiler needs a switchable 230V supply or has connections for a volt-free thermostat. The valves will require 230V to run the motor, which opens the valve. The difference is the way the valve switch is wired.
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