How To Heat a Pool Without a Heater
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How can you heat a swimming pool without a heater? The best steps to heating a pool with no heater is going to be to introduce as much free heat to the water as possible, and then retain as much of that heat as possible by limiting evaporation of the water. Evaporation of the pool water is responsible for over 95% of the heat losses to the water in your pool. If you are trying to heat up your water then it would make sense that you want to try to keep any heat you are able to generate.
Having a cover on your pool (especially at night) is the number one thing pool owners can do to prevent evaporation which reduces heat losses directly. A solar blanket on the pool every night is the best method to accomplish this and the best part is that they are rather affordable. A solar blanket might only be one or two hundred dollars, which is a steal of a deal when it comes to talking about pool equipment and pool accessories - everything is expensive about owning and maintaining a pool!
DIY solar heater that any pool can use - If you don't have a pool heater that's okay because solar heating is a great option for warming up your pool. Sure it will not give you extreme results like a gas pool heater or even an electric heat pump but a solar installation of any kind will incrementally increase your water temperature. Not ever house will have the availability for a roof top solar heater, but as explained in the video above you could easily fit a pipe connection to one of your pool return lines and connect this to a black garden hose that you can wrap around the pool deck. As the water passes through this smaller, black hose it will certainly pick up some warmth from the sun. Small pools will see dramatic increases in termperature from this after only a few sunny days of operation (turn off at night to avoid the reverse effect - heat loss through the hose on the pool deck) where larger pools will notice some incremental imrprovements but will need more pipe and longer running time to achieve appreciable results. Still, every degree matters (it really does!) when you are talking about swimming in cold water!
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