Upnor UFH manifold

[leesparkykent]

Just wondering if someone could help and tell me what this is on the manifold? noticed it on a manifold ill be wiring up after Christmas and never come across it before. The cable coming off it has two black cores. Cheers Lee

 

[Chalked]

Can't zoom in on the pic. But the Uponor manifolds have a high limit stat. This cuts the pup on high manifold temp.
it brigs it back when temp falls.

 

[ShaunCorbs]

could be the high limit cut off

 

[leesparkykent]

Thank you.....A quick google after being pointed in the right direction and its exactly that Wired in series with the pump and brown of the two port.