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Hi. I'm refurbishing an old working system that still has a soon-to-be-replaced Netaheat heat only boiler. The old system has a tendency to suck air and develop stubborn air-locks. One reason being the rather long horizontal pipe runs. But the system design may also be at fault. I have...

A strange object has been found fitted at the back of a boiler feeding a fully pumped 27 year old vented heat only system. Water dripping from this device is a hazard as it can enter boiler electronics. But what is it and can it just be removed and replaced with a blanking plug? It...