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Since my last post a Worcester Bosch engineer has been out and replaced the HE (again) and so at least the system is functioning without the need for the 5am daily top-up ritual to which I had become accustomed! I’ve also been in touch with Chelmer once more and I have to say this time I seem...

Agile - I don't know how to calculate the house's heat loss unfortunately. It's a Victorian end of terrace, 4 storeys with all external walls insulated with solid wall insulation (50mm of celotex type stuff which is bonded to plasterboard). I would say the 22 rads are generally average sized...

Thanks for your advice and support, gordonspants. Good to hear from someone who has had experience of similar things. Your summary is pretty much spot on. The only real difference is that my store actually has 2 zone valves on it rather than one. The upper part of the store provides the DHW...

>>Have you considered contacting Chelmer and asking for their advice? Yes, I have spoken to them on numerous occasions over the last 2 years, sometimes helpful, sometimes not. This installation was not designed by them so they are of limited help. I have contacted their local recommended...

Crikey! Seems I've inadvertantly fired up some emotions here. Perhaps I did not provide sufficient info in my original post. Please forgive me, it was my 1st post after all. Taking the various remarks in turn: Agile: Thanks for your response. What is the signifcance of the alloy HE as...

Hi all My first post on here! Have read loads of useful info but couldn't find the answers to my problems so thought I'd put it to you all. Hope someone out there can help. We have a fairly complicated sealed system installed in our house and I'm tearing my hair out trying to resolve...