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Hi there, Not a plumber but tell you what we have. Firstly, agree with other posts depends upon your pressure! We have a coffin cold water tank in our loft and a high pressure pump at the base of our boiler which is "water on demand" activated, in other words, when you demand water it...

I have the above boiler and once the reserve tank in the boiler is empty the hot water stops. Have had several engineers look at it, replaced Manin PCB (twice) and the Therophister, still same problem. Ani help appreciated