This is the lowest price we’ve seen on this Summer Waves Solar Mat at Only $18.99! Keep the water in your pool warm and comfortable during the day or even at night with the Summer Waves Solar Mat. Drawing power from the sun’s rays, it offers an energy-efficient solution. The temperature of water is increased by five to 10 degrees for more relaxing, enjoyable swimming. Easy to set up and operate, this pool heater mat connects to your existing pump using the included hose attachment points. The water is then cycled through and warmed by direct sunlight exposure before being returned.