I learned swimming, 6,5 years ago. And I went on holiday to Paphos, Cyprus. My swimming teacher said: ” Swim everyday, for practice”. But the water in the Hotel Pool was very cold. This is the moment where I got the idea to make a portable Pool heater.
First it was with a garden hose and a Solar Fountain Pump ( 12 Volt – Safety ) . Now it is with a Solar Mat, and it is portable and foldable.
* New : Solar Swimming Pool Heater
no need of electricity !