60 Degree maximum. 40 Amp 3 Phase electric instant hot water heater with digital display. The intelligent fully-electronic water heater compensates for fluctuations in pressure and temperature and using its series of sensors it precisely regulates the hot water output. This ensures that you get your requested hot water temperature to the degree. These units save energy by heating water only when required, unlike storage water heaters that are constantly heating and reheating water to maintain the desired temperature.