Electronically controlled circulator pumps for domestic building and thermal solar systems. Shinhoo GPA II pumps are high-efficiency circulators, designed for heating and thermal solar systems. The ideal choice for basic functionality needs. Applicable as a universal upgrade and replacement pump. The pump features three constant-curve modes, proportional pressure curves, constant pressure curves, Auto and night mode. The speed can also be controlled by a low-voltage PWM signal from a controller to optimize the system performance. Circulator pumps GPA II series Suitable for: · Commercial heating · Commercial hot water recirculation · Domestic hot water recirculation · Domestic heating · Industrial heating · Solar system · Air conditioning system Electronically controlled circulator pumps for domestic building and thermal solar systems.