Zilmet ZHT8-15 Hydronic Expansion Tank 1/2" NPT 2.1 Gal

The Zilmet ZHT8-15 Hydronic Expansion Tank is a diaphragm-type vessel designed to absorb volume changes in closed-loop water heating circuits as fluid temperature increases and decreases. It is equipped with a 1/2 inch NPT connection and provides a 2.1-gallon capacity for small to mid-size hydronic circuits. In HVAC systems place this tank on boiler lines and hot water loops where pressure variation needs controlled accommodation during thermal expansion cycles. The internal separation design keeps air and water chambers divided, allowing steady pressure balance across piping and connected equipment during operation.