2.1G HYDRONIC EXPANSION TANK

Product description

Zilmet ZHT8-15 Hydronic Expansion Tank
The ZHT8-15 is a compact 2.1-gallon diaphragm expansion tank designed to absorb pressure changes in hot water heating systems (boilers, hydronic loops).

Key specifications

• Type: Hydronic (heating system) expansion tank
• Capacity: 2.1 gallons
• Connection: 1/2" NPT
• Max pressure: ~60–75 PSI (varies by listing)
• Max temperature: 210°F
• Material: Carbon steel shell with rubber diaphragm (SBR)
• Use: Non-potable closed-loop heating systems

What it does

In a boiler system, water expands when heated. The ZHT8-15:

• absorbs that extra volume
• stabilizes system pressure
• prevents pressure relief valve discharge or system damage

Typical applications

• Residential hydronic heating systems
• Baseboard heating
• Radiant floor heating
• Small boiler systems (up to ~50,000 BTU setups)