On Mon, 24 Dec 2007 14:11:46 -0800, dawoodseed wrote:

Another question:

After being recommended to us a S plan system with 2 port valves, I'm
thinking why 2 valves and why not one 3 port valve?

What happens if you were to use 1 2 port valve?

Christmas Greetings to all.

When a motorized valve cost was about the same a say a half day's labour.
It made some sort of economic sense to fit one valve which took a bit
longer to fit.

Now the valves have come down in price (there under £20 in the BES
catalogue - Honeywell compatible), and the labour for 1/2a day has gone
up a lot. The whole balance is in favour of using 2 or more valves.

--
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
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html