I just bought a treadmill and the instructions direct me to plug it into a dedicated 20 amp circuit. The waterpump for our "jacuzzi" bathtub is on a dedicated 20 amp circuit and is used at most once a year. I am thinking of simply running a line from this same circuit such that the treadmill and the waterpump are on the same circuit (and unplugging the waterpump from its own outlet). This way, only one "appliance" will ever be plugged in to the circuit, even though there will technically be two outlets. What, if any, are the downsides to this approach?