The water level in a luxury swim spa hot tub is not necessarily better the higher it is, nor should it be too low. Generally, when using a luxury swim spa hot tub in a home or private setting, the water level should be controlled at 70%-90% of the total tub depth.

If multiple jets are turned on, the increased water flow will also increase the pump load, which may actually reduce the heater's heating efficiency. This is because the heater requires a certain water flow rate to effectively transfer heat, and excessive water flow may dilute the heat transfer effect.