Installing a replacement boiler. I now have a wall mounted unit with flow and return pipes upwards from the top of the boiler.
The flow continues upwards from the boiler, but the return from the floor level must now go up vertical alongside the boiler and then an inverted U to the boiler return pipe.
I feel that I need a vent at the top of the U to release any trapped air, logically I cant see a problem - or is there?
TIA