| Model | VFD-50 | VFD-100 | VFD-175 | VFD-250 |
| Inlet Connection Size | 1-1/2″ (38 mm) | 2″ (51 mm) | 2″ (51 mm) | 2-1/2″ (63 mm) |
| Outlet Connection Size | 1-1/2″ (38 mm) | 2-1/2″ (63 mm) | 3″ (76 mm) | 4″ (102 mm) |
| Body Material | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel | 316 Stainless Steel |
Armstrong Variable Frequency Drive Pump packages are used in tandem with Armstrong Flo-Direct® or ReadiTemp® water heaters to maintain flow and pressure levels at variable usage draw-off points within a hot water distribution system.
Standard and custom-designed assemblies are engineered specifically to the needs of each installation site to provide an efficient, complete hot water solution with low energy consumption.
