Higher install cost, and you are shifting your hot water heating requirements from cheap centrally heated water, to that done with peak rate electricity in most cases.
Secondary return on the hot water?
Apr 13, 2012
23 Replies
Agreed, but it depends on what pipe length and corresponding heatloss, together with a pump running for most of the day, compared to actual water usage.
According to sources cited in the Wikipedia article
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tends to die above 50 - 55C, and absolutely dies at 70C. But maybe harry knows something the World Health Organisation, Chartered Institute of Plumbing ad Heating Engineering and Health and Safety Executive don't?
Indeed - as with all these things, the devil is in the detail, and there is no substitute for actually doing the numbers to see what really makes sense.
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