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Thanks for both these. The neutraliser looks like a solution - till I saw the price which is comparable to a new cylinder. I shall look more closely at the Systemzone approach for which I could see no prices. Tony, it is an oil fuelled device so has some control over heat output via the...

I have an old house with similarly antiquated plumbing modified over 80 years. To resolve a major air lock I have had to separate the boiler (central heating and secondary hot water cylinder circuit) from a Rayburn stove (also feeding the same jumble of pipework) and fit motorised valves. The...