... standard, selection available ) 8,Electromagnetic valve parameter: DC 12V, AC 220V, pressurized valve and un-pressurized valve are available for selection, 9. ... suitable for providing water directly operation pressure of un-pressurized valve: 0.0Mpa, 10. connected with water tank or ... Manual heating 13,Timing heating 14,Hot water circulation 15,Hot water pipe insulation 16,Low pressure protection 17, ...