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Thank you, Chrishutt and Croydoncorgi. You have highlighted something I overlooked, although the Danfoss TP5 is battery powered it could still switch a voltage without using that current to power the thermostat. This perhaps is also the reason why the "Switch rating of the relay contact" is...

I have a 3 year old Protherm 100 EC. I have purchased a Danfoss TP5, no voltage stat and Danfoss have told me (by email) which 2 terminals to connect to the boiler (2 +3) but they will not tell me what gauge wire I can use. I would like to use "bell wire" and as there in no volt I can't see why...