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It depends on many factors. Some of them are:

  • how deep the pool is;
  • how cold the pool water is;
  • how hot the hot water is;
  • how cold the air is;
  • how cold the surrounding ground is;
  • how windy it is; and
  • how warm you want the pool water.
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Q: How many gallons of hot water do you need to add to heat your 4' by 15' pool?
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