50 000 BTU heat pump pool heater or hot tub heater. Heater uses the warm air to heat pool water thru heat transfer medium. Used 2 summers for outdoor 23000 Liter pool to heat 30 C. Worked great. Basic heater costs $ 4200. Deal includes Connectors , pool piping and hoses to flow water ( $ 1000 value). GFI disconnect box included Need 220 volt 30 amp power supply. Just Add water !!!