In an earlier contribution to this discussion,
John Rumm wrote:


There is no need to move anything usually. The combined timer/stat is
a direct replacement for the current stat - not the current timer. The
current timer would be removed - or left permanently switched to "on"
leaving the stat to control the heating (timing and temperature).

Except that a programmable room stat will only control the heating - *not*
the hot water. A more usual arrangement would be to:
* keep a normal 2-channel programmer, and use it to programme the hot water
* switch the CH control on this programmer to "permanently on"
* Use a programmable room stat to control both the timing and the
temperature required for the heating

This is what I did, and it works fine. Additional features of this
arrangement a
* Everything can be switched off from a single point (original programmer)
* If any future occupier can't cope with a programmable stat, they can use
it in manual mode and revert to programming the heating with the original
programmer.

--
Cheers,
Set Square
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