1.Case material optional metal shell and spray coating, 304 stainless steel, ABS plastic housing. 2.LCD or LED or Dot-matrix touch screen wire controller for option. 3.The Macon Pool heat pump features a new 3D high tooth spiral titanium heat exchanger, DC inverter twin-rotary compressor and Super-Silence inverter control system. 4.3D high tooth spiral titanium heat exchanger has 30% more heat transfer area and 30% improved efficiency. 5.The DC inverter twin-rotary compressor minimises vibration and achieves 20% noise reduction and allows a super heating capacity of 120% in one touch. 6.These energy savings enable achieving a coefficient of performance (COP) of up to 20 and deliver 32kw of heating with single-phase and 40kw with three-phase power,setting new record highs in pool heater. 7.Super Mode boosted 120% capacity for faster initial heat up and recovery from overnight temperature drop. 8.Smart Mode 20-100% heating capacity with intelligent maintenance of pool temperature. 9.Silence Mode 20-60% heating capacity with low-speed and low-noise operation.