Introducing the NEW Zilmet USA ZEP-1 Stainless Steel Expansion Tank and Shock Arrester for Tankless and POU Water heaters with 2 gallons or less of total water volume.
Most tankless water heater manufacturers require a thermal expansion tank with their water heaters when a backflow preventer is required. The compact ZEP-1 is the perfect solution for providing thermal expansion protection in tight places. Stainless steel construction and NSF 61 certified. www.zilmetusa.com
Table for pressure v volume for the ZEP1:
| Air Pressure (psi) | Volume (mL) |
| 0 | 173 |
| 20 | 150 |
| 40 | 136 |
| 60 | 91 |
| 80 | 73 |
| 100 | 55 |
| 120 | 18 |
| 140 | 5 |
| 150 | 0 |