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Bit of a mystery...


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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.

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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.

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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. 

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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.

 

image.thumb.png.e7cd1e88e2b6e6cd0e627cc4a05c5226.png

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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.

 

image.png.e6d7bae1ba3491e6b40c2c99e09b9512.png

Edited by sharpener
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3 hours ago, ReedRichards said:

Are you sure that the cleaner does not come early?

 

Positive. Apparently, only men come early 🙄

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  • 1 month later...
5 hours ago, Nick Laslett said:

Hello @NSS, any success in trouble shooting this problem?

Inconclusive. It was definitely the heat pump coming on, even though neither heat nor tank were programmed to run at the times it was happening (random Monday mornings), and none of the room stats were calling for heat. It's only happened once more since I reported the problem, and not since I put all the room stats into frost protection mode, so I may have to wait until next winter to see if it's still an issue.

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