Heat Well and Eco-Friendly.VINGLI solar heater panel doesn't require electricity but is powered by solar energy keeping the water warm quickly and longer.The tube grid design captures the most sunlight and converts it into heat.Note: Water pump pressure is not less than 0.75HP and pressure does not exceed 1.5bal(21 PSI). Durabel Material. The solar collector panel is made of durable PE material, which is able to work at temperatures as low as -20°C (-1°F) and as high as 90°C (194°F). Additionally, the black PE material design has excellent heat absorption properties to maximize solar energy for optimal heating. It can efficiently heat up to 10°F if you use the quantities we recommend by the size your pool. Easy to Install:This solar pool heater install was fairly easy.Works with most inground pools, pumps and filters. Each package contains dimensions of 2 x 20FT.You can connect multiple heaters together, depending on how many you need for your pool.Comes with a variety of connection fittings to securely connect the solar pool heater to your hose. Suitable for Multiple Places. The solar heater can be rolled up and placed in a variety of places. It can be used in both above and below ground pools. You can place it on the ground, on an inclined frame or on the roof. Hassle Free Warranty:VINGLI pool solar heater offer you 1-year warranty, 24-hours friendly customer service. Any problem please contact us without hesitation. Please contact us send you additional soft hose if you need HOW THE SOLAR HEATER WORK ? The low-temperature swimming pool water at work, after being recycled by the swimming pool filter equipment, enters the swimming pool heater through the pipeline under the pressure of the water pump, and is irradiated by sunlight, so the cycle is carried out.