Abstract: A remote hot tub control system for a hot tub includes a controller and an input device. The controller is configured to execute a draining and filling cycle of the hot tub. Upon receiving a user command at the input device to initiate the cycle, the controller commands an output valve to open and a water pump to pump used water out of the hot tub via the output valve. Upon receiving a first signal indicating that the hot tub has been drained of the used water, the controller commands the output valve to close, the water pump to stop pumping, and an input valve to open to permit fresh water to enter the hot tub. Upon receiving a second signal indicating that the hot tub has been filled, the controller commands the input valve to close.