In an earlier contribution to this discussion,
Lurch wrote:


Not without major repiping you won't, if you just replace the
programmer and stat you won't be able to do any more than you can now.
To be able to have independent control you need to upgrade the whole
system to a Y-plan or similar.


No, the best bet is to go for a C-Plan (See
http://content.honeywell.com/uk/homes/systems.htm)

You can keep your existing pipework, just inserting a zone valve into the
gravity hot water system and adding a cyl stat. If you still get gravity
circulation through the radiators when the pump is not running, you'll also
need a null flow (anti-gravity) valve in the CH pipework.
--
Cheers,
Set Square
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