Wiring diagram for fully pumped Honeywell S plan
"Keefiedee" wrote in message
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The boiler is oil - about 5 years old. Not sure what you mean by
overrun stat. Please clarify.
Runs for a period after the boiler has finished to allow the heat to be
removed from the boiler.
You don't need one with a gravity loop but the boiler may need one if you
remove the gravity loop.
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