摘要 |
An electric water heater for use with a livestock water tank includes a heating element, a housing including a drain plug fitting, and a power cord. The power cord is interconnected with the heating element through a temperature control device, e.g. a thermostat, for delivering electrical power to the heating element in a controlled fashion so as to regulate the temperature of the contents of the tank. The heating element and housing are sized and configured for insertion through the drain plug opening from the outside of the tank. The housing includes a drain plug fitting for affixing the heater to the tank through the drain plug opening in a sealed manner, thereby preventing inadvertent removal of the heater and also preventing the contents of the tank from leaking out of the drain plug opening. The fitting includes a threaded portion or boss sized for insertion through the drain plug opening and a back wall which is larger than that of the drain plug opening. The power cord extends from the back wall of the housing and the heating element extends from the end of the housing opposite that of the back wall. The heater is installed into the drain plug opening by inserting the heating element and the housing through the drain plug opening from the outside of the tank until the back plate of the housing rests against the outer surface of the tank around the drain plug opening. A rubber gasket or washer is positioned between the back plate and the water tank to seal around the drain plug opening. A reciprocal nut threads onto the threaded portion of the housing from inside of the tank to secure the housing to the tank.
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