Models can converge with only one boundary present (e.g. ending with a manual valve). This approach is VERY PRONE TO WRONG ANALYSIS especially when modeling large / complex or transient networks where missing a pipe connection is frequently encountered.

In FluidFlow, we are receiving many support tickets related to models not converging due to incomplete connection and is thus a common issue in our Users. This makes the concern above more important to address.

Either add a warning message, include in the pre-calc checklist or force a convergence error if the model does not have the complelete element of a solvable model.