1. High efficiency: New double coil titanium exchanger, with phnix patent, extends the exchanging route and ensure the high efficiency. Titanium gas coil, having best corrosion-proof to pool water and no influence to water quality, ensure the whole system longer running life. Using worldwide famous brand's compressor ensure the whole system highly efficient. 2. Intelligent controller: Electronic digital controller can effectively control the water temperature within 1 degree centigrade of set point.The controller also allows users to set different water temperatures for various needs. 3. Heating and cooling water: Heating and cooling water are both available.Automatically switch to cooling or heating mode according to your water temperature.Create a comfortable pool for you. 4. Environmental friendly: We use r407c and r410a as refrigerants and it's harmless to our earth.