Balboa VS100 10" 4.0kW Flo-Thru Heater (26-58203-K) prostar Matching the original connection style

Matching the original connection style often helps make the replacement more straightforward and less disruptive

The Hayward diffuser is designed for compatible TriStar and EcoStar C pump applications where the internal flow-directing component needs replacement

That means a cleaner replacement path and fewer compromises during installation

It improves both the visual finish and the user’s confidence in the control surface without requiring a full panel replacement

replacing the full assembly can produce a much more complete result than trying to rebuild the seat one piece at a time

Balboa VS100 10" 4.0kW Flo-Thru Heater (26-58203-K) prostar Matching the original connection styleBalboa VS100 10" 4. 0kW Flo Thru Heater (26 58203 K) is a compact replacement heater designed for compatible VS100 spa control applications. Its shorter 10" body distinguishes it from the more common 15" heater format, making physical dimensions especially important when identifying the correct replacement for the existing plumbing layout. The VS100 application uses a compact equipment arrangement, making heater length and plumbing fit especially