How long to heat a 25000 gallon inground pool with gas heater?

The time it takes to heat a 25,000-gallon inground pool with a gas heater depends on several factors, including the initial pool water temperature, the desired pool temperature, the heater's efficiency, and the outdoor temperature. On average, it can take approximately 24 to 36 hours to raise the temperature of a 25,000-gallon pool by 20 degrees Fahrenheit (11 degrees Celsius) using a gas heater. Here's a general timeline:

* Initial Setup: Allow 1-2 hours for initial setup, including connecting the gas line, filling the heater with water, and setting the desired temperature.

* Warm-up Phase: During the initial warm-up phase, which may last 6-8 hours, the heater will work at maximum capacity to bring the pool water up to a pre-determined temperature that's about 10 degrees below the desired temperature.

* Final Adjustment: Once the pre-determined temperature is reached, the heater will enter the final adjustment phase. Depending on the remaining temperature gap, this phase can take an additional 6-12 hours, gradually bringing the pool temperature to the desired level.

Keep in mind that actual heating times may vary based on specific heater brand, weather conditions, and the efficiency of the heating system. For a more accurate estimation, refer to the specific instructions and information provided by the manufacturer of your gas pool heater. Additionally, factors like sun exposure and proper heater sizing can also impact the overall heating time.