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Another set of questions in context of my home-brew solar water heater:

  1. Can poly-plastic water storage tanks, be used to store hot water (140deg F / 60deg C) ?

  2. How can I thermally insulate a 50 gallon / ~190 litre, vertical poly plastic water tank (like the ones shown here), to minimize heat-loss overnight ?

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I have seen commercially made solar hot water tanks made of poly but don't know the composition to avoid leaching –  UNECS May 16 '13 at 9:00
    
Thanks @UNECS. Good to know that there are commercially made solar hot water tanks made from poly. Regular water storage tanks, I believe - are anyhow expected to withstand water temperatures of upto 50degC, but reading around a bit, I think typical solar heated water can easily reach 75-80degC (peak), which is really pushing the limits. –  icarus74 May 16 '13 at 13:20
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