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I have a solar water heater system that takes a lot of sun hours to warm up and that cools down too fast. I live in Puerto Rico, so the outside air temps and sun hours are not the problem. After 10 years, I believe the problem is that the water tank is too big (120 gals) for the number of sun tubes.
The only opening of the tank is approximately 2 inches wide, to screw in the electric heating element. Is there any material I can induce into the tank, that would expand (like a balloon) so as to reduce the capacity?

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    Pictures would be good. Also a short explanation of the design of the system and how it works. – Paul Logan Nov 30 '17 at 17:16
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    If it cools too quickly, reducing the water volume will exacerbate that. You can't have it both ways without insulation. – isherwood Nov 30 '17 at 17:25
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    sounds more like you need better insulation for the tank – ratchet freak Nov 30 '17 at 17:45
  • How many gallons per minute is your circulating pump rated for? You could parallel that with another pump to increase flow rate during peak sun hours. – ArchonOSX Nov 30 '17 at 18:45
  • The system has a number of glass tubes that heat the water in sun light. There is no pump, but the heated water moves up to the tank. I have tried insulation around the tank with little improvement. The problem is that the water cools after one day without sun, whereas other systems seem to keep warm for several days. – Rob Nov 30 '17 at 19:01

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