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Thanks for the advice guys.

Not an expert, but I think what he is saying is correct. They are weak by nature. We installed the most powerful one you can run off standard mains, and it's mediocre at best. Works better in summer than winter (because then the incoming water is not so cold) The water pressure is good...

I've looked in the wiki and searched other posts but cannot find an answer. I'm not a heating engineer, but like to think I'm fairly logical and can work things out when/if I understand how things work. Basically I'm wondering if it is a likely failure mode for an automatic bypass to fail...