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In page Solar water heating:

"

The simplest collector is a water-filled metal tank in a sunny place. The sun heats the tank. This was how the first systems worked.[1] This setup would be inefficient due to the equilibrium effect: as soon as heating of the tank and water begins, the heat gained is lost to the environment and this continues until the water in the tank reaches ambient temperature. The challenge is to limit the heat loss.

  • The storage tank can be placed in conditioned or semi-conditioned space, reducing heat loss.
  • Drainback tanks can be used.[citation needed]