... and level inner ank Auto filling water, Connect electrical heater, much safe. Complete automatic Technical date1. Power supply: AC220V ... Accuracy of temperature control: ±2 centidegree5. Water level grade: 5 grades 0,20,50,80,100%6. The power of pump or ... valve:0.0Mpa,apply to water supply from water tank or low water pressure.10. Low power of color LCD screen:0.5W Solar water heater controller BL-80