Choosing the right pool heater for your inground pool depends on several factors, including the size of your pool, the climate in your area, your budget, and your preferences for energy efficiency and operating costs. One secret from my experience which may help you somehow is considering the weather patterns in your area. If you live in a location that experiences colder temperatures or has a shorter swimming season, it may be worth investing in a more powerful pool heater to ensure your pool stays warm and usable for as long as possible. Conversely, live in a milder climate. A less powerful or energy-efficient pool heater may be sufficient, and you can consider alternative heating methods, such as solar blankets, to save on operating costs.