Enter the desired temperature rise, the size of the pool, and the heater output into the calculator to determine the time to heat the pool.

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## Pool Heat Time Formula

The following formula is used to calculate the total time it takes to heat a pool.

T = S * 8.33 * t / HP

- Where T is the heat time in hours
- S is the size of the pool in gallons
- t is the desired temperature rise (F)
- HP is the heater output power (BTUs/hr)

To calculate a pool heat time, multiply the size of the pool in gallons by 8.33 times the desired temperature, then divide by the heater output power.

## Pool Heat Time

**How long does it take to heat a pool? **

The time it takes to heat a pool depends on three factors:

- The size of the pool. The larger the pool and larger the body of water the more time it will take to heat the pool.
- The needed temperature rise. The more temperature difference you need to acheive the longer it will take.
- The power output of the heater. A more powerful heater will reduce the time it takes to heat the pool.

## Example Problem

How to calculate pool heat time?

**First, determine the size of the pool.**For this example, the pool has 30,000 gallons of water.

**Next, determine the temperature rise that needs to be achieved.**For this problem, we would like to raise the temperature 20 degrees F from where it is now.

**Next, determine the power output of the heater.**The power output for this heater is estimated to be 400,000 BTUs per hour.

**Finally, calculate the time to heat the pool.**Using the formula above, the pool heat time is calculated to be:

T = S * 8.33 * t / HP

T = 30,000 * 8.33 * 20 / 400,000

T = 12.495 hours