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Ah.. so you mean... megaflo (by heatrae sadia) is sealed system which only provides hot water in taps and got inbuilt expansion vessel with T&R valve.. but the heating system is open vented as there's a tank in loft. Is this what supplies water in radiators? Also shouldn't I expect some sort of...

attaching picture of loft tank. There are no valves there. Pipes are coming from airing cupboard into loft. One of those pipe is main cold water.

Pipe is coming from flow and going into return. Attaching picture

Hi, I need bit of an advice about finding the filling loop in my heating system. Apologies for long description but thought to cover as much so relevant solutions can be suggested. I have spent endless hours searching internet including this forum and everywhere it is mentioned there must be...