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Size is the main difference between a pool and a spool. Spools are typically about half the size of an average pool, so they’re ideal for yards without the space for a full-sized pool. Spools are also easier to heat, so they tend to be a higher temperature than pools and can be adjusted to get as hot as a spa when it’s time for a relaxing soak. Spools also contain jets and blowers, while most pools do not.

The time it takes for a pool heater to heat a pool can range from eight to 48 hours, with an average of about 12 hours for the initial heating. For a more specific example, an average-sized 15,000-gallon pool may take six to 10 hours to heat up by 10 degrees. The exact duration depends on several factors, including the pool's size, the type and size of the heater, the starting water temperature, and the outside air temperature. It may take some trial and error to determine the precise time your specific pool takes to reach a desired temperature.

It’s best to avoid draining your pool onto your lawn for several reasons. Most importantly, your local municipality may not allow homeowners to drain pools in areas where it can seep into groundwater. Additionally, draining pool water on your lawn can cause erosion and damage your grass.

A pool chiller will take anywhere from 12 to 14 hours to lower your pool's temperature by 1 to 15 degrees. Most people tend to run their coolers overnight, but larger pools in warm climates take longer to cool. Choosing a chiller with the right capacity can help speed up the process.