W
the pump often runs for longer than the burner (i.e. for a while after the latter has switched off) in order to continue circulating hot water through the system and (in some cases) to avoid water boiling off in the burner and damaging the heat exchanger (?).
Thanks - only saw your reply now. However the system (including burner) in this case is of c. early/mid 70s vintage and yet it was always wired such that the pump and burner were switched simultaneously. It's survived this long so I left well enough alone. She also got the burner cleaned/serviced recently. Your man said it was the dirtiest he'd ever dealt with (!) but it was fine and the system is still going strong.It is relatively safe with modern burners/boilers to have the pump wired in line with the burner as there will be a high limit thermostat in the boiler which will cut the power to the burner in the event of serious excess heat.
You will find when the pump is wired seperately that there is a thermostat on the flow very close to the boiler which runs the pump. If that thermostat is in place you can leave the pump switch on and it only runs when the hot water in the flow is up to temperature.
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