Finally remembered to ask the friend who had one of these things
http://www.myson.ie/pages/trv3.html
It's an electric powered radiator valve that fits in place of the normal
thermostatic valve head. It uses the same base unit as a thermostatic
valve
NO PLUMBING!!
(unless you count the cables)
BTW he said that they were a bugger to get hold of (18months ago) since
the
people in sales have never heard of them!!
HTH
Dave
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