The first module, Silvestro "S", is for designing and sizing plumbing systems. It lets you calculate flow rates, balance circuits, trace flush pipe layouts, size pipes, insulation, fittings, valves and pressure and flow rate gauges.

CAD combined with error diagnostics is used, so designs can be quickly corrected and changed. An important feature of Silvestro is that designs can be imported to/exported from AutoCad. Complete materials lists can also be processed and used with Silvestro "M".