The NEW CALOREX Pro-Pac range of Pool Heat Pumps has the latest invention from Calorex as standard. This is the Intelligent Automatic Defrost. Your heat pump will no longer get covered in frost in low temperatures or turn itself off awaiting defrost. It will simply send a small amount of hotter refrigerant through the coil for a few moments to do away with frost before it can settle. No other heat pump has this and it makes the Pro-Pac far more efficient than its competitors when running in lower temperatures.
See more at http://www.acair.com/pool-heating/