Zilmet ZHT35 Hydronic Expansion Tank 3/4" NPT 9.2 Gal

The Zilmet ZHT35 Hydronic Expansion Tank accommodates thermal evaporation of water within closed-loop heating systems. This vessel features a 3/4-inch national pipe thread connection and holds 9.2 gallons of capacity to absorb pressure fluctuations as water heats and expands. The tank contains a flexible diaphragm that separates water from a pre-charged air cushion, preventing system over-pressurization and protecting components from damage. Integrated on hydronic heating circuits, it stabilizes pressure levels throughout temperature cycles, ensuring reliable operation of boilers, radiant floor systems, and hot water distribution networks. The unit prevents relief valve discharge and extends system duration by managing volumetric changes.