Caldera hot tubs are designed to be hot and ready for use at any and all times, unlike the in-ground spas. Caldera hot tubs are extremely energy efficient. They feature hot tub insulation and covers with the optimum efficiency to ensure the lowest possible energy costs.
It will take several hours for your hot tub to heat up with new fresh water. The amount of time will depend on the number of gallons used to fill your tub. The Owner’s Manual should provide more insight as to how long it will take for the temperature to get back up after a water change.