Optimum boiler temp and hot water temp

Steve S (another one) · 2008-03-14T09:39:22+00:00

I have a Vaillant EcoMax Pro condensing boiler and also a Superduty fast recovery hot water cylinder. When the boiler was installed the installer set the boiler temp to 65C. A year later, a different guy from the same firm came round to do the 1 year warranty check and insisted it should be 70C. What is the optimum value, if there is such a thing? Or would I be right in thinking that it's the return temp that's more important, and that it should be 55C or less?If it's the return temp that's important, then I have a supplementary question... I understand that hot water in a cylinder should be heated to 60C in order to prevent the growth of Legionella bacteria. Is this correct, and if so, how do I reconcile the two requirements -- return at 55C or less, but hot water >= 60C?Ta,Steve S

Mar 14, 2008 20 Replies

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David Hansen 18 years ago

On Fri, 14 Mar 2008 18:49:47 GMT someone who may be "Steve S \(another one\)" wrote this:-

They survive, but don't do a lot. Raise the temperature and they rapidly multiply and so are likely to reach dangerous concentrations. Raise the temperature more and they die.

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Optimum boiler temp and hot water temp

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