Secondary loop pump + pipe stat

Hi Guys

Recently finished a new build house.
Commissioning engineer came in the other day (2nd visit whilst I wasn't there) and mentioned we need to put a pipe stat on the secondary loop pump.
We've only ever wired these as on/ off time controlled.
Apparently it's regs (heating engineer we work with hadn't come across this either before)

Any else aware of this ?

If so I assuming it's to prevent pump running if pipe is not up not temperature ?

Thanks Sy

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