We have a gas heater with solar water panels. Like HVAC for your house, it can't keep up with the BTU's of gas and cannot get the pool warm enough in the cooler months. My wife likes the water temperature close to 90. I joke that she is actually swimming- Su Vide. We use the solar water panels in the warmest months alone and both in the other months. Solar alone will not suffice in the winter or on cloudy days.
Remember that in the coldest of months, unless you are submerged up to your chin, the cold air temperature will make your upper body cold and become unpleasant.
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