What size heater for a 27 ft round pool?

To effectively heat a 27 ft round pool, you'll need a heater with a capacity of around 100,000 to 150,000 BTUs. This range will allow you to raise the water temperature efficiently, depending on your desired temperature and the climate. Additionally, consider factors like the pool's depth, local weather conditions, and whether you will be using a pool cover, as these can impact the heating requirements. Always consult with a pool professional to determine the best heater for your specific situation.