Installation tip from a professional 👷🏻 Not every design is suitable for every arrangement of solar hoses. If the hoses are inclined or vertical, we recommend using the HPRL design. The reason for this lies in the hydraulics. In this case, the HPRL design enables natural ventilation. ♨️ If air remains in the RIPPultimate solar heater, the heat output would be massively restricted. 📉 However, the U-design can also be used for flat installation or for horizontally running corrugated pipes. Fortunately, we at SOLAR-RIPP have various designs on offer for you. 😊 Design your absorber surface according to your wishes.