... and water circulation Makes the whole split system work efficiently Working Station KitsInclude:Circulation pump, expansion tank 5L~8L, controller, manometer, flow ... -meter, pressure relief valve, copper fittings etc.Technology data:1. working volt: AC220V, 50HZ(optional)2. Consuming power: <3W3. temperature test ... . electric heater power: 1500W.7. creepage currency: ≤10mA/0.1s Working Station Kits