Consultation on the basis of boiler cost estimation

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a) Hello, in BioSTEAM, the boiler cost is estimated according to the amount of steam generated by the boiler. Is it more reasonable to estimate the boiler cost with the boiler's feed flow (solid feed flow or gas feed flow or the sum of feed flow)? If so, is it necessary to modify the boiler source code? Or can I just call other code to do this for above purpose now?

b) For boiler in BioSTEAM, it seems impossible to distinguish the different prices of medium-pressure steam and low-pressure steam at present (https://github.com/BioSTEAMDevelopmentGroup/biosteam/blob/master/biosteam/facilities/_boiler_turbogenerator.py). The current logic is that the boiler burns natural gas as the feed, and the heat generated by combustion is equal to the heat of medium-pressure steam and low-pressure steam required in the process, but it seems that only the price of natural gas needs to be set in this way. Without setting the price of medium-pressure steam and low-pressure steam, it seems impossible to distinguish the price of medium-pressure steam and low-pressure steam, and the prices of medium-pressure steam and low-pressure steam are actually different.