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...