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Never create Nodes manually.

You need to add the heating coil to the demand side of a PlantLoop instead.

Example: https://github.com/NREL/OpenStudio-resources/blob/d4e2965946c54fff2f5aeae9130c13861b24a58e/model/simulationtests/zone_hvac2.rb#L200-L204

 zoneHVACBaseboardRadiantConvectiveWater = OpenStudio::Model::ZoneHVACBaseboardRadiantConvectiveWater.new(model)
baseboard_coil = zoneHVACBaseboardRadiantConvectiveWater.heatingCoil
hotWaterPlant.addDemandBranchForComponent(baseboard_coil)
zoneHVACBaseboardRadiantConvectiveWater.addToThermalZone(story_1_core_thermal_zone)