"W" wrote in message
...
Hi,

What are the pro's and con's of S Plan vs Y Plan heating arrangements?
I am getting a new heating system and I don't know which one to go
for.

TIA, W

The Y plan 3 port valve is cheaper to initially buy than two zone valves and
there is less pipework involved in connecting it.
I had Y plan on my old system and the main item that regularly failed was
the 3 port valve motor - so my new system uses S plan zone valves which are
likely to be more reliable as they are either open or closed rather than 3
position.
Another advantage of S plan is diagnosing any faults should be easier - it
is easy to determine if the valves are operating correctly compared to the Y
plan 3 port types.

When selecting valves to use - there are many makes to choose from, some
better than others for similar prices.
I chose the Honeywell V4043H as it appeared to be well made and has a good
reputation (my plumbers merchant agreed with my choice also).

Dave