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I was asked to assess a solar system for a government apartment building. System had 22 Steibel Eltron Sol 25 Plus C flat plate collectors running through a brazed plate exchanger which serves two 500 gallon domestic storage tanks. The glycol is burnt. Since repairs are going to be made they want the system redesigned. They want to eliminate one of the storage tanks and use it for storage of high temperature glycol which can then be used as stage one to heat domestic water into the evening. This will require a lot of glycol. Is their a better way to do this? I have installed only a few solar systems and they were all engineered. Your input is greatly appreciated.