Why have an NRV with a secondary hot water circulation pump?

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Sorry, I get the feeling there is a sub text in there for some reason but it's too subtle for me.
To be honest,your regular unvented cylinder service operative will be able to comment on your possible nrv fault.if its not to much of a nuisance just leave it to the next scheduled inspection/service :!:.

every property is different and need different servicing schedules.

:rolleyes:
 

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