Hi, I am currently working on adding new choices for water heating desuperheater object. desuperheater. Look at this pull request for more details. Hopefully the next E+ release would at least cover the capability of modeling desuperheater with source type "Coil:Cooling:WaterToAirHeatPump:EquationFit"(so GSHP is available to combine) and "Coil:Cooling:DX:MultiSpeed". Besides, the tank type "WaterHeater:Stratified" would be also allowed.allowed.