fluid type in EnergyPlus

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Hi! I want to make a plant loop consisting of WaterHeater:Mixed and Boiler:Steam.

At PlantLoop class list, I entered 'Steam' at fluid type and then an error occurred.

Error message said,

** Severe  ** Existing Fluid type for node, incorrect for request. Node=STEAM BOILER PLANT STEAM SUPPLY OUTLET NODE
   **   ~~~   ** Existing Fluid type=Steam, Requested Fluid Type=Water

So I I entered 'Water' at fluid type and then an error occurred because of the similar reason. (fluid type is incorrect at WaterHeater:Mixed connected nodes.)

I think I need to make fluid type which is water below 100 degree Celsius, and turn into steam above 100 degree Celcius at Group FluidProperties.

Am I right? I've tried copy lists from FluidPropertiesRefData.idf but it didn't work. Help me if anybody knows how to solve this problem!!