The hydraulic calculation of the heating project in Revit is performed according to the American ASHRAE methodology. But with the correct pipeline connections, configured connectors, and the direction of movement of the coolant, the program considers the hydraulics of not only pipes, but also with parametric Revit families. it takes into account losses in heating devices. Revit's hydraulic calculation is comparable to Russian standards and calculation parameters. Therefore, it can be used in projects of houses not only small, medium, but also large heating systems. The Revit program provides hints in the form of error reports in case of incorrect design.