I think he has gone to the effort of drilling up to the tile from behind ,why not live the drill bit into the hole and with a metal detector point exactly
where the drill bit is and drill the tile normally easy .
I installed one today and straggled with the room thermostat .I have a Vaillant manual RT and it has three terminals L,N and a sun picture in the middle .
Do you mean connect L,N to the boiler feed and the other one to RT trminal?
Here is the manual on pdf page 29 is the wiring diagram ...
COESTHERM - COES - FUSION - TUBO -ACCESORIOS - YouTube
is in Spanish but you get the idea .
I do not think is more expensive than the unreliable Speed fit ,push fit stuff if the wholesalers start to supply the market and the fusion/weld machine
is not more expensive than your combi drills
copper is a precious metal and its getting very expensive ,plastic is a recyclable material and much cheaper .
Just I hate the push fittings and this method its been used in Europe why not here,I know is used on mains Gas and Water why not in domestic!!!
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