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The Vaillant manual says that the filling loop does have a double check valve, but is also insistent on removing the loop "Close both stop valves after filling and detach the filling device by pulling the double check valve from the cold water stop valve." and elsewhere "The system can be...

BTW my installer left the filling loop connected to my Ecotec 824 plus, and both of the grey filling loop valves were letting-by. Grr.

I'm using Pad+beam for a small single storey extension. I can use cheap precast concrete beams (lintels), and it'll save time and materials. As a bonus, I can wrap polystyrene insulation around the bottom of the beams, and kill the thermal bridge which you normally get between the wall and...