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hi
solar hot water is great but i will advise you to be very carefull who you use to supply and install your system as just any plumber can say hes an expert so i advise you to ask them for a list of 5 customers that you can approach that have had there system for up to 3 years to ask what they think of there system john
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Flat panel drain down system would be my preference. No issues with over heating then.