KFR-THP21 Air Source Heat-pump Heater for Swimming pool Pond 21 kW 71000 Btu:
"The THP21 air source pool heater has a highly efficient Japanese inverter technology Toshiba compressor with typical COP of 5.8. That means that for every 1000 watts of electricity you are getting 5800 watts of heating. Compared to regular electric or oil systems the energy saved would pay for the cost of the unit within the first two years. Easy installation"
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