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If it's an external pump then that's probably not the case
But the pump still needs to be connected to the boiler so the overurn is controlled (time or temperature.

Pump is in airing cupboard next to control panel. Boiler is in outhouse some 20m away. Boiler has pump over run capability but not used as a few years ago, before I moved in, it replaced a really old boiler without overun and nobody gave it a thought.
The existing cable could be used to power the pump and provide the required overrun..
 
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But the pump still needs to be connected to the boiler so the overurn is controlled (time or temperature.


The existing cable could be used to power the pump and provide the required overrun..


Yes. The pump should be controlled through the boiler. If he follows wiring diagram of mainslink rf then pump feed can come out of boiler into Lout which will switch Lin in other receiver. Alternatively you could link boiler Lin and Lout but this would be a constant live to pump and not timed
 

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