grundfos upm3 hydra gps external pwm signal controlled solar boilers 3 Temperaturdifferenzregler The documentation also explicitly emphasizes

The documentation also explicitly emphasizes the need for professional commissioning and user instruction

and activating special functions like "System Off" or "Away"

Energy efficiency index

Thanks to its high reliability and precise fit

This makes the boiler technically designed for operation with solid fuels and the typical requirements of a boiler room

grundfos upm3 hydra gps external pwm signal controlled solar boilers 3 Temperaturdifferenzregler The documentation also explicitly emphasizesSolar pump 20 8 130 PWM Hydra GPS II The Hydra GPS solar pump 20 8 130 PWM is an electronic and energy efficient pump with high efficiency. Designed for solar heating applications, it is controlled via an external PWM signal (stepless speed control), ensuring maximum energy yield. Its excellent price performance ratio makes it a popular replacement in many systems, such as the Grundfos UPM3 Solar 15 75. Advantages of the solar pump: EEI0. 21 developed