Product Power: 2KW. Designed for hot and cold tubs, this thermostat is suitable for bathtub SPA. The water heater will start working when the bathtub is filled with water. The bathtub water heater should be connected to the tubing circulation system, and can also be connected to the inlet and outlet of the bathtub pump to ensure that the direction of water conforms to the instructions on the bathtub water heater.
eBay