The voltage of the primary motor will be either 110V or 220V. If your existing motor runs on 220 volt current, you should order a replacement motor that runs on 220V too. A 220 volt system is really two dedicated 110 volt wired paralleled to each other. In 110 volt systems, the electric current is pulsed in one direction. In 220 volt systems, the current is alternately pulsed in both directions. So, a 220 volt system can run 110 volt accessories, but a 110 volt system cannot run anything that requires 220 volts.

If your spa currently runs on 110 volt current, you should consider upgrading to 220 volts. This will, however, require you to change the wiring and circuit breakers between your home’s electrical control box and your spa.