| Model | Volume of the expansion tank | Maximum operating pressure | Color | Connecting an inch |
| VS18 | 18 | 10 | White | ¾ ” |
| VS35 | 24 | 10 | White | ¾ ” |
| VS24 | 35 | 10 | White | ¾ ” |
| VS50 | 50 | 10 | White | ¾ ” |
| Model | Volume of the expansion tank | Maximum operating pressure | Color | Connecting an inch |
| VS18 | 18 | 10 | White | ¾ ” |
| VS35 | 24 | 10 | White | ¾ ” |
| VS24 | 35 | 10 | White | ¾ ” |
| VS50 | 50 | 10 | White | ¾ ” |