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Ok Tony, I'll freely admit I don't know the inner workings of a combi that well, care to enlighten me or provide a link so I can expand my knowledge?

Yeah think I said that they wouldn't, even though I won't be storing the water as it's straight off the phe so the chances of anything growing is non existent. The boiler dhw temperature is fully adjustable down to about 20'c so I think I'll be OK with it modulating down.

Hi Mogget, I see our posts crossed, thank you for taking the time to research the pressures. I must however disagree with your conclusions. The maximum differential pressure of the valves wouldn't really apply as the tap or shower would be turned off first, which would build up the pressure in...

Hi Mogget, Thanks for your post. How are you getting on with your thermal store? Why do you feel an unvented would be better? an unvented is limited to about 3 bar, if yours is installed correctly you can have whatever pressure your mains water can deliver, or be boosted to if you're in a low...

Yes Tony, If I had a fully serviceable unvented cylinder I may agree but this one is only good for unvented now and I still have the same functionality. I take it you're not a fan of heat banks or thermal stores then? I'm waiting for all those early unvented cylinders with electronic anodes...

Hmm, I've seen the zone valves used in this way before and don't see any problem, I know some of the cheapo`s are not full bore but I'm sure the ones I have are, I'll check. Thanks for the question.

Just standard 22mm 2 port motorised zone valves and a flow switch if you mean c, d and FS on the diagram. with a blending valve after the PHE.

Hi Bernard and Tony, Thanks for your replies, I completely agree with what you say but it will be me who fixes it, we're never leaving this house and I`m doing the best I can with what is available, and as I completely agree this will not produce massive savings I am unwilling to pay out...

Well I did expect the ridicule! :-o Thanks for all the constructive replies guys & girls, the whole point of this is its going to cost me next to nothing comparatively. which is probably why the local dealer and fitter doesn't approve. I am doing this because I need to serve 3 to 4 mixer...

Hi All, I've been studying this and other forums for months off and on and putting all the ideas into a do it all system. I am posting my plans for fitting a heat bank to a combi boiler using a converted 300L unvented cylinder for comments / suggestions and probably ridicule. First a bit of...

diagrams

Many Thanks Woody, Today is actually my Birthday and I believe you have just given me the best present I could get! From what you have told me I`m in the clear. Getting a photo of the site is not easy due to the lay of the land but I can email you the auto-cad plans I have to confirm if...

Hi All, Apologies if I should have started a new post but as the cases are so similar i thought I`d save a bit of time. Woody, if you don't mind I`d like to ask you a bit more about your statement above. I am in a similar situation to the OP. Ie Ground sloping up hill 4.5m over a 13m...