NSS Posted April 16 Author Share Posted April 16 12 minutes ago, JohnMo said: You actually run that? Why? Why wouldn't I? Link to comment Share on other sites More sharing options...
ProDave Posted April 16 Share Posted April 16 27 minutes ago, NSS said: Why wouldn't I? If you have treated mains water into an unvented tank. there should be no bacteria in the incoming water and no way for any to get in, so several people have concluded it is pointless to heat it hotter once a week. Private water or vented cylinder, yes you do need to do it. 3 Link to comment Share on other sites More sharing options...
JohnMo Posted April 16 Share Posted April 16 5 minutes ago, ProDave said: Private water yes you do need to do it. Not sure then either, as long as it's filter and UV treated, and you use most of the cylinder contents daily again no need. Link to comment Share on other sites More sharing options...
NSS Posted April 16 Author Share Posted April 16 12 minutes ago, ProDave said: If you have treated mains water into an unvented tank. there should be no bacteria in the incoming water and no way for any to get in, so several people have concluded it is pointless to heat it hotter once a week. Private water or vented cylinder, yes you do need to do it. Must have missed that debate. That said, for much of the year the solar lifts the tank temp to the desired levels. Outside of that, the sterilisation cycle of our heat pump is fortnightly rather than weekly, and runs during the cheap Intelligent Octopus rate at night, so cost is minimal. Link to comment Share on other sites More sharing options...
garrymartin Posted April 16 Share Posted April 16 7 hours ago, ProDave said: If you have treated mains water into an unvented tank. there should be no bacteria in the incoming water and no way for any to get in, so several people have concluded it is pointless to heat it hotter once a week. If it helps people in making the decision about whether to run an anti-legionella cycle or not, the following is from the excellent Heat Pumps for the Home book by John Cantor. 1 Link to comment Share on other sites More sharing options...
sharpener Posted April 16 Share Posted April 16 (edited) 38 minutes ago, garrymartin said: If it helps people in making the decision about whether to run an anti-legionella cycle or not, the following is from the excellent Heat Pumps for the Home book by John Cantor. and there is also this which I have taken from the HG site (though IIRC it was not originally theirs), the other significant axis is turnover rate. Personally I think the risk in domestic premises is vanishingly small. We use filtered and UV treated rainwater and even when we are away the PV keeps the tank at 55C all the time, so have never had a problem with it in 17 years. Edited April 16 by sharpener 1 Link to comment Share on other sites More sharing options...
ReedRichards Posted April 16 Share Posted April 16 Given that your heat pump is off anyway, you could make absolutely sure it is off by cutting its power and see if that makes any difference. Are you sure that the cleaner does not come early? Link to comment Share on other sites More sharing options...
Nick Laslett Posted April 16 Share Posted April 16 Everybody loves a mystery. I hope @NSS is able to solve it without too much drama. 1 Link to comment Share on other sites More sharing options...
NSS Posted April 16 Author Share Posted April 16 3 hours ago, ReedRichards said: Are you sure that the cleaner does not come early? Positive. Apparently, only men come early 🙄 Link to comment Share on other sites More sharing options...
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