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<blockquote data-quote="Rick" data-source="post: 635510" data-attributes="member: 317022"><p>There is bacteria in the water that comes from the water main. There is not enough bacteria to cause any harm though.</p><p></p><p>The regs in the UK state that hot water has to be stored above 55 degrees centigrade as most bacteria including leigonella starts to die. Cold water must be stored below 20 degrees as the bacteria cannont grow below this temperature.</p><p></p><p>If you fill a container with water and seal it, and leave it to warm up to say 40 degrees the trace amounts of bacteria in the water will begin to multiply. The only way to avoid this is to boil the water before storage in a sterile container to neutralise the bacteria in the water.</p><p></p><p>At 60 - 70 degrees in your roof top heaters the bacteria will die not grow so you are safe. </p><p></p><p>Generally the solar heaters in the UK will heat the water in secondary tank to around 18 degrees, this is then fed into the main hotwater cylinder which will be heated by a boiler to 60 degrees. The energy saving being that is takes less energy to heat water from 18 - 60, than it does from 4 - 60. 4 degrees being around the average temperature in the water main.</p><p></p><p>Hope that clears it up. <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Rick, post: 635510, member: 317022"] There is bacteria in the water that comes from the water main. There is not enough bacteria to cause any harm though. The regs in the UK state that hot water has to be stored above 55 degrees centigrade as most bacteria including leigonella starts to die. Cold water must be stored below 20 degrees as the bacteria cannont grow below this temperature. If you fill a container with water and seal it, and leave it to warm up to say 40 degrees the trace amounts of bacteria in the water will begin to multiply. The only way to avoid this is to boil the water before storage in a sterile container to neutralise the bacteria in the water. At 60 - 70 degrees in your roof top heaters the bacteria will die not grow so you are safe. Generally the solar heaters in the UK will heat the water in secondary tank to around 18 degrees, this is then fed into the main hotwater cylinder which will be heated by a boiler to 60 degrees. The energy saving being that is takes less energy to heat water from 18 - 60, than it does from 4 - 60. 4 degrees being around the average temperature in the water main. Hope that clears it up. :) [/QUOTE]
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