Why is it important to know this, surely it is important only to know the quantity, flow rate and temperature in and out? what it is used for is irrelevant, don't you think.
In theory you might be right (although I think you have to add pressure to your list). But in practice it would be important too see the customer side to make sure there was no trickery or invalid measurements.
I think it is strange to defend a set-up where IH's is supposed to pay 89 million without being allowed to see the customer side.