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I would like to simulate an air-to-water heatpump for DHW and heating with inlet air = outdooor air at temperatures ranging from appr. -20°C up to +25°C. For this purpose I tried WaterHeaterHeatPump with user-defined performance curves by DataTable:TwoIndependentVariables objects for biquadratic approximations of (relative) heating capacity and COP as functions of outdoor air temperature and water inlet temperature.