# Water properties default model - IFC67¶

If no EOS is specified for WATER, the density, viscosity, internal energy, and enthalpy of pure H2O are taken from the steam tables [IFC10]. With this method the properties are valid for a pressure and temperature range of $$0 < P < 1000$$ bars, and $$0 < T < 800$$ °C. Although very accurate, this method can make the problem more difficult to solve, and can cause some convergence problem in some cases.