| 摘要 |
A process of electrically heating a spa having electrically operated devices connected to the spa, such as one or more water pumps, lights, and at least two heaters, in an environment in which there is not enough current to operate all spa devices simultaneously. The process includes the steps of providing a control system with data as to which devices are connected to the spa and how much current each device requires, and how much current is available to the spa. Next, the amount of current that is being used by the devices currently operating, other than the two heaters, is calculated. This provides the amount of the residual current available. If the spa water temperature is below a desired temperature, a determination is made as to whether there is enough current to operate one or both spa heaters and either one heater or both heaters are turned on based upon this calculation.
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