Zilmet ZTTA-12 Thermal Expansion Tank 5 Gallon

Product Description

The ZILMET ZTTA-12 is a 5-gallon thermal expansion tank designed to absorb excess pressure caused by thermal expansion in closed-loop potable water and hydronic heating systems. Fitted with a fixed diaphragm, the tank separates the system water from the pre-charged air chamber, protecting pipes, valves, and water heaters from overpressure damage. This type of component is typically installed by licensed plumbers and HVAC technicians as part of a code-compliant closed water system.

The ZTTA-12 is suited for residential and light commercial applications where a backflow preventer or pressure-reducing valve creates a closed system. Common install scenarios include domestic hot water systems paired with storage-type water heaters, as well as hydronic heating loops requiring pressure management. Its 5-gallon capacity makes it appropriate for small to mid-sized system volumes.

Key Features

• 5-gallon tank capacity for residential and light commercial closed systems
• Fixed diaphragm construction separates air charge from system water
• Designed to protect plumbing components from thermal expansion overpressure
• Compact form factor suited for typical mechanical room installations

Compatibility

Designed as an OEM-style replacement or new-installation expansion tank for closed-loop potable water and hydronic heating systems requiring thermal expansion management.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and IPC guidelines. Shut off the water supply and relieve system pressure before installation. Verify the tank pre-charge pressure matches system supply pressure prior to connecting. Do not exceed the rated working pressure of the tank or system.