Request for heat exchanger pressure

Hello, for heat exchanger in the tutorial (https://biosteam.readthedocs.io/en/latest/API/units/heat_exchange.html), it seems to be not mention pressure. I tried HXutility and HXprocess. After setting T or V, HXutility seems to have the same outlet pressure as that of inlet pressure, but under the same conditions, the outlet pressure of heater will be reduced in the Heater of Aspen. Is it because the outlet pressure and the inlet pressure are set to be consistent in heat exchanger of biosteam. Thank you for you help. Wish you a good day.

Start with the heat-exchanger tutorial linked in the issue and review the stated behavior of HXutility and HXprocess after setting temperature or vapor fraction. Compare their outlet-pressure behavior with the Heater behavior described for Aspen; the issue is complete when the pressure handling is verified and clearly documented or the remaining behavior is explained.

Written by the indexing model from the issue text.