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?
This appears to be an odd arrangement to me. Normally, the flow and return
pipes run together in parallel, rather like the live and neutral of an
electrical circuit. Do you have an old single pipe radiator circuit? On the
other hand, sometimes the flow goes off to the cupboard to get valved,
whilst the returns all meet up somewhere else.
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