Temperature control system for electric fluid heater

摘要

An electric water heater of the type in which the water is heated by passing electricity therethrough is covered on all surfaces with an electrically insulative covering bonded to the water heater chamber and to the surfaces of all ports communicating with the water chamber. The insulated ports communicating with the water chamber are shaped to enclose a predetermined volume and configuration of water to limit the conductivity of the leakage path from the electrodes within the heating chamber through the ports to external ground connections. Electronic Control means responsive to a temperature sensor in the liquid being heated is provided for controlling the flow of electric current to the heating electrodes. The electronic controller includes means to limit the maximum current passed by the heating electrodes. The control circuit also limits the amount of power developed across the electrodes.