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Now I know its called an Aerjec, Google has provided me with hours of rabbit holes.. seems the consensus is they trap more sludge than air, bin it! Thank you all. most helpfull

Looking at this pic of what looks to be the same (why did the prior owner paint everything silver), would make out for my pump to be connected to the vent and the cold feed used as output with output capped off.

Thanks Terry, that makes sense, What I don't have then is the head top-up feed, only the vent. Would you say that is an incorrect or poor design choice? Would make sense is the kettling is concentrated here then.

Yep Hard indeed.

Pedent ;) Yeah, I meant thermostat :)

DWBoiler by Welshtog posted 14 Mar 2021 at 12:46 PM

Hey everyone, first time posting so please be gentle :) Ideal classic heat only vented system that started kettling during hot water heating most times and every now and then on radiator heating. I have: Fitted an auto vent, thinking it was air as the little screw vent always seemed to have...

what is this?