Share 'Estimating Commercial Building Hot Water Use'

I'm preparing an NC EILP report for a geothrmal upgrade and am having trouble determining how much HOT WATER will be used in the building.  This info is needed to determine savings attributable to the desuperheater.  i can't seem to find a protocol to estimate hot water use in commercial buildings.  Specifically, this is for office / retail space.   The client is on a well and has no idea how muc…