ZoneHVAC:LowTemperatureRadiant:VariableFlow,
    LozaRadiante_Zona1,      !- Name
    ,                        !- Design Object
    Constant,                !- Availability Schedule Name
    NORTH PERIMETER,         !- Zone Name
    GrupoSuperficies_Zona1,  !- Surface Name or Radiant Surface Group Name
    autosize,                !- Hydronic Tubing Length {m}
    autosize,                !- Heating Design Capacity {W}
    ,                        !- Maximum Hot Water Flow {m3/s}
    Nodo_Demand_Inlet,       !- Heating Water Inlet Node Name
    Nodo_Demand_Outlet,      !- Heating Water Outlet Node Name
    ,                        !- Cooling Design Capacity {W}
    ,                        !- Maximum Cold Water Flow {m3/s}
    ,                        !- Cooling Water Inlet Node Name
    ,                        !- Cooling Water Outlet Node Name
    OnePerSurface,           !- Number of Circuits
    106.7;                   !- Circuit Length {m}

Program Version,EnergyPlus, Version 25.1.0-68a4a7c774, YMD=2025.06.25 00:08,

   ** Severe  ** bad allocation
   ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
   ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.

            thisRadSys.designObjectName = Alphas(2);
            thisRadSys.DesignObjectPtr = Util::FindItemInList(thisRadSys.designObjectName, VarFlowRadDesignNames);
            VarFlowRadDesignData variableFlowDesignDataObject{state.dataLowTempRadSys->HydronicRadiantSysDesign(
                thisRadSys.DesignObjectPtr)}; // Contains the data for variable flow hydronic systems