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This type of system has been working well for many years though mate.In one word - oxygen!
I don’t really fit alloy heat ex’s to be honest mate. Maybe that’s why I haven’t had an issue.It worked well when hex pathways were big & they were made of cast iron. Now they tiny & made of ali they block cos oxy causes crap in system.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.