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Does fitting frost and pipe stats remove need for Alphi-11 then? Might it not just as well be added, as an inhibitor has to go in anyway? Cheers

I have an open vented central heating system with an oil condensing boiler. The boiler, (Warmflow B90), is fitted outside the kitchen wall. Therefore there is a short run of about 6 feet of outside pipework, which is lagged. The downstairs has suspended floors with pipework below. The site...