seocndary DHW circuit components help needed

To switch it off when the pipe work reaches temperature.
Look at the Grundfos UB 20-14BXUT . Product number 96433890

Do you know if there is a simple thermostat which could be connected to a pump and stop it once hot water is pumped through the pipe during time periods set on Vaillant programmer ?

Yup. Google "pipe thermostat".

Very good idea this.
 
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