... .low pressure start gas water heater 2.Flame Failure Protection,big LED screen 3.Anti-freezing ... : once water pressure is over than 1.0Mpa, the unit heater will relieve the pressure automatically to avoid damage.5.Low ... : when water pressure is less than 0.025Mpa, the water heater can also startup, it is suitable to the user who ... /4”pipe;Gas inlet:G3/4”pipe 2011 Gas water heater