Go to Family Category and Parameters . Check or "Fluid Flow" .

If you have already spec’d a unit from a brand like Bell & Gossett or Alfa Laval, download their RFA file. However, be warned: manufacturer families are often "heavy" with over-modelled geometry that slows down your project.

Select each connector individually and precisely map its properties in the Properties Palette: Set inlets to In . Set outlets to Out . System Classification:

System Type: Hydronic Supply (or Other depending on fluid); Flow Direction: In .

Always validate your family in a test project before deploying it to a live team environment. Test all parameters, verify connectors are functioning correctly, and confirm that the family schedules as expected. If possible, have another team member review your family for consistency and usability.

Assign OmniClass number 23.25.11.11 (Heat Exchangers).

Before starting from scratch, explore available manufacturer resources. Many manufacturers provide pre‑built Revit families for their products, including shell and tube heat exchangers. For example, Armstrong’s Digital‑Flo series offers shell and tube heaters with integrated digital controls as Revit families available for free download. The NBS BIM Library also provides plate heat exchanger Revit families with pre‑defined parametric values for length, width, height, connection sizes, and clearance zones. Using manufacturer‑provided families ensures accuracy and saves significant modeling time.

Change the length and diameter parameters to extremes to ensure the geometry doesn't "break."

I can provide or nested family strategies based on your goals. Share public link

and assign their flow, pressure, and system types. Add Shared Parameters for scheduling and procurement.