Pool pumps are powered by either 115 volts or 230 volts. It's common to find pumps that can be configured to operate on either power depending what is easier for the owner. If you are replacing a pump that operated on 115 volts it makes it a lot easier to replace it with a pump that runs on the same. It is not necessary but it will save a bit of time during installation.  A typical home electrical outlet uses 115 volts and is the easiest type of installation. If your pump is hardwired and/or required an electrician to install it is most likely operating on 230 volts. If you are unsure we recommend using a multimeter to test your connection in addition to reading the specs on the pump itself. If you are not familiar with electrical connections hire a professional to install your pool pump.