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Danny, I think there's a problem with the way you're interpretting your numbers. From what you posted, I can say You can't have this H_in = H_out *and* have different numbers. Thus, what I posted earlier is absolutely wrong in its assumptions: here is the correct technique.
Saturated steam assumes that you're at 100% vapor, right on the verge of forming the first droplet of liquid water. Look at the value of H_liquid for saturated conditions(there should some value similar to this for your exit P and T. One value for the enthalpy of the liquid, one for the value of the vapor. You know your "true" H value = it's specified by your inlet conditions. I'm guessing that the H_inlet value is between these two values of H_liq. and H_vap. at your exit condition. Interpolate between the H_liq and H_vap values, where x (amount vaporized) for the liquid is x=0, for vap its x=0.
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