Circulation pumps GPA IV Suitable for: ·Commercial air conditioning ·Commercial heating ·Commercial hot water recirculation ·District cooling ·District heating ·Domestic hot water recirculation ·Domestic heating ·Cooling ·Industrial heating Electronically controlled and high efficiency circulation pumps for commercial building The Shinhoo GPA IV circulator pump is the premium choice when system control is key. GPA IV supports PWM and low voltage -10V external control.