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What's the best pool heater for the colder months? Well, it depends on where you live and the size of your pool. If you live in a colder climate or you have a large pool, get a gas heater. It's the most expensive to buy and run, but it's the most powerful heater. However, if you live in a milder climate, get a pool heat pump.
These heaters will save you tons of energy, but it doesn't work below 55 F.