Q. "What does it mean by dual voltage?"
A. The pump is labeled as dual voltage because it includes the wires so that it can be connected to a 230V or 115V power source.
Q. "What's the advantage of having the pump hardwired?"
A. One of the reasons hardwiring is used is because long cords won't always deliver enough voltage to the motor.
Q. "What's the difference between an automatic and non-automatic pump?"
A. An automatic pump has a built in float switch that will turn on the pump automatically at a fixed water level. After the water is pumped out to certain water level (also a preset level), the pump will turn itself off. A non-automatic pump has to be manually turned on and off, or with a separate control like a piggyback float switch.
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