Underfloor heating temperature too high?

[panlondon]

Hi,

I had recently a brand new underfloor heating installed. See pic. The temperature on the hot side almost at 80C and the cold coming back is 55. I am reading that the max temperature should around 55C. Is my underfloor heating working ok or can it be damaging the concrete underneath? Any other comments you have? Thanks very much.

 

[Nozzle]

Any chance you could take a photo showing the needles and numbers on the dials?

Nozzle

 

[Lower]

Is that a thermostatic mixer valve under the pump?

80 degrees is too hot. If the pipes are in a screed, you don't want the water temperature more than 45 degrees and 55 degrees if the pipes are under a floating wooden floor.