This is called 'non-simultaneous operation' since both elements are not 'on' at same time. But not both at same time. Each thermostat is wired separately. How to test elements. Anode rods. Necessary Supplies In order to change an element you'll need the following: Less hot water is available.
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And when you're tightening down the screw, you want to make sure that you tighten it down so that way the wire will actually wrap around the screw rather than pushing it out.
Standard Electric Operation
Hot wire from Volt breaker connects to Black wire at top of heater. Changing a heating element is a relatively simple task, however, you will be working with electrity AND water. Not best strategy if consumer uses a lot of hot water, since all hot leaving tank is replaced by cold entering tank, and new cold water must be heated to set point. Thermostat opens and closes second hot wire to element. Redundant thermostats: Be sure insulation and covers are put over thermostats so thermostat not exposed to cool temperatures and cause temperature misread. Can possibly cause more stacking events Both thermostats control lower element.