... 7.4 8.9 Heating Capacity(2)kW9.0 12.0 15.0 18.0 BTU/h30800410005120061500COP(2)W ... /W3.263.263.263.26Input Power(2)kW2.76 3.68 4.60 5.52 ... 7.0 8.4 Heating Capacity(3)kW9.6 12.8 16.0 19.2 BTU/h32800437005460065600COP(3)W ... high and low voltage protection, compressor overtemperature, compressors flow, power supply phase sequence,ensure unit works in hash environment.Optional ...