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Ed Sirett
 
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On Fri, 18 Feb 2005 10:16:46 +0000, Christian McArdle wrote:

If a combi is used with a vented cylinder, then 2 zone valves are
required, one for the heating and one for the hot water, BUT what if I
want to split the downstairs heating from the upstairs heating....


The hot water cylinder forms a zone, just like a radiator zone. Each zone
needs a 2 port valve and a thermostat, whether it be a cylinder thermostat
or programmable room stat. If you had a cylinder and 2 heating zones, you'll
need three 2 port valves. The existing pipework will determine if it is easy
to divide into upstairs and downstairs zones.

Is it best to use the honeywell cm67 wireless package!!!!!!


It is very well regarded, but a little ugly, and very pricey if you start
having multiple zones.

..... and only needed if the hassles/costs/disruption of running a wire
makes it attractive.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html