Heater, Low Flow

A Lo Flow heater in a hot tub is associated with the circulation pump, which is a low-flow pump that moves the water through the filter system. 
This pump operates even when the hot tub is not in use. The more water that moves through the filter, the cleaner your hot tub water will be.

The Low Flow heater works on demand. The circulation pump pulls the water through the heater tube, warming it as it passes. This system also keeps the water at a slightly higher temperature, making it easier to heat your hot tub.

Between the insulation on the outside of your hot tub shell and the lid you keep closed on your hot tub when not in use, the heat loss is minimal. This means that even though the heater is low flow, it’s still very effective at maintaining a comfortable water temperature.