In an earlier contribution to this discussion,
Derek * wrote:


But if the pipeology is cold to start with how will the pump ever get
to know when to start?

I described a method of doing it in a post a couple of days ago. The pipe
stat needs to have change-over contacts. The one which connects when the
pipe is cold is connected to the boiler's switched live. The one which
connects when the pipe is hot is connected to permanent live. Common is
connected to the pump. So:
* Cold Pipe: the pump runs whenever the boiler receives a heat demand
* Hot Pipe: the pump runs until the pipe cools down

Simple, eh?
--
Cheers,
Set Square
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