Shinhoo GPD series circulator is suitable for: Commercial heating Domestic hot water recirculation Domestic heating The Shinhoo GPD and GPS circulator pumps are designed for heating, domestic hot-water, cooling and air-conditioning systems. The pumps are available in various materials, making them suitable for a range of applications. The pumps are reliable and maintenance-free. 1.Pump contains two parts: body and motor (with wet rotor).Body contains impeller, while motor includes stator, rotor, shield cover and deflating screw. 2.Tightness:the pump does not use mechanical seal. Stator and rotor are sealed with shield cover made of stainless and two heat-resistant rubber rings, which makes no leakage. 3.Lubrication of bearings and cooling of motor by inner circulation of pumped liquid. 4.Insulation class H, motor fixed with thermal protector, one speed or three speeds.