From the original question.
But plumbed heated rails can also have an electrical element so they can be warmed when the CHB is off.
this one isnt eclectically heated, only water ( thru Hep2 PLASTIC piping, all the way to the boiler)
BTW yes Im sure I would be jumping if I get a "belt" as you say, from the Spanish kitchen appliance, but I dont read about that many tourists etc who Do get zapped! _ maybe its 'cos most just eat out! ( or maybe we are just way over the top with our safety regs?)