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Dan I need help LLH? thermal stores? smokebox

Now the NUB of the matter! We have all done our homework and understand what a smart pump is. (see my earlier links), I am sure!!! http://www.grundfos.pt/web/homept.nsf/ad40134eb90502a6c1256ac400234192/66f8bfa661086e0b802574cd003071c2/$FILE/Grundfosliterature-815904.pdf You cannot...

Agile thanks for remarks! I think you are quite right about poor software. Surely on an eBUS system you could anticpate actual zone closure and put out the flame a minute earlier! Might be difficult with older fashioned type of "on" "off" controls, but not impossible. I do think the eco...

Lord Hailsham I totally concur all you say. I now have a boiler which is I hope going to be OK for my house though it still only modulates down to 5kW, so I am not totally confident. I did look up Geminox on Google - not a very informative website. I think it is a French manufacture...

xr4x4x I am pleased proper bypassing is being done, because I think it is "illegal" not to in new installations. smokebox

Am I right about part L requrement for "auto-bypass? Do "Gas Safe" know about this? Do decent fitters agree? smokebox Edit post script. What does Lord Hailsham say to this?

norcon Agreed especially if the rad sugested by others is under zone valve control. smokebox

To mysteryman Weather compensation is planned, and I plan a discussion of how it will interact with the auto adapt pump behaviour in a future thread. I believe however it has little to do with the protection of the heat exchanger in the pump over run period after flame and zone shut down...

http://www.grundfos.pt/web/homept.nsf/ad40134eb90502a6c1256ac400234192/66f8bfa661086e0b802574cd003071c2/$FILE/Grundfosliterature-815904.pdf I think this links to a useful Grundfos PDF on Alpha2 pumps smokebox

http://net.grundfos.com/doc/webnet/poweredby/gb/alpha2_explorer.html I think I have inserted a link successfully to the Alpha2 explanatory web pages! In the page called Explorer a rough depiction of pump characteristics can be seen. In Autoadapt mode the pump is working in the grey...

Thanks mysteryman. I am not so sure about your solution, though it would certainly prevent kettling and bangs etc. Are you not saying introduce a large or at least significant permanent bypass in effect ? This however will substantially heat the return temp and significantly reduce...

Hailsham and Agile thank you for responses. I am very sorry I had to stop the thread just after starting and it petered out. [illness] So we don't need yet grade A or A* yet! Even in "part L".and/or CHeSS guidelines? I confess to hearing differently but can't say where. Agile "But the...

I have recently had a Vaillant ecoTEC plus 428 fitted in my house. The pump is the Grundfos Alpha2, which costs twice as much (approx) as an ordinary 'Three Fixed Speed' type of pump. However I specified it because it is much more energy efficient (of electricity obviously !) and is "grade A "...