In an earlier contribution to this discussion,
jgharston wrote:


My system at home looks nothing like any of those diagrams. For a
start, those diagrams have three or four water pipes going to the boiler,
my
boiler only has two water pipes

The diagrams are *schematics* - showing how they *function* rather than
exact representations of the pipework. With the exception of W-Plan they all
show 3 connections to the boiler. But it doesn't take a lot of imagination
to visualise what they would be like if you combined the HW and CH returns
before taking then back to the boiler. There would then only be 2 boiler
connections, and they would look more like your diagram.

see http://mdfs.net/Docs/Plumbing/Heating.gif


That's useful - I can see what you've got, and it almost certainly pre-dates
any of the standard Honeywell 'plans'. In the 60's and 70's, the 'norm' was
to have a gravity HW circuit and pumped CH circuit. What you have is one
step up from that in that it's fully pumped. But it still doesn't provide
independent control of HW and CH (you can't have CH without HW) nor boiler
interlock - as provided by most of the 'plans' - and the thing is that it
would be so easy to update it to take advantage of a much better control
system.

jives11, if your system is the same as mine, then:


No it isn't - he's got a proper S-Plan system.
--
Cheers,
Roger
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