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Thank you very much for your reply - much appreciated It has clarified some of what I was thinking and also confirmed the reason for not being able to pump the thermosyphon loop. Thanks

Hi I wonder if anyone could advise. I am doing a project where I would like to add an alternative external heat source into an old central heating system. The system currently has a very old Ideal type E conventional flue boiler which uses a thermosyphon for the hot water and a pump for the...