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Q: How do I size a heater for my pool

A: Determine the area (Length x Width.) of your pool surface. Decide on the temperature rise per hour that you want. And then consult this chart. Heat rise will vary slightly when dealing with different heaters. We usually recommend an increase of 1 - 2 degrees per hour.

Pool Size -Square Feet

BTU Size 500 Sq. Ft. 650 Sq. Ft. 800 Sq. Ft.
200 1 degree 1 degree -
250 1.5 degrees 1.5 degrees -
350 2 degrees 1.75 degrees 1 degree
400 2.5 degrees 2 degrees 1.5 degrees