Description
The Zilmet ZETA-15 is a high-quality, ASME-rated hydronic expansion tank built to manage pressure fluctuations and volume changes in closed-loop heating and cooling systems. With a 7.8-gallon shell volume (approx. 6.3 gallons acceptance volume), this tank helps protect boilers, radiators, heat exchangers, and piping — ensuring safe, efficient system performance.
Designed to meet rigorous industry standards, the ZETA-15 uses a fixed-diaphragm construction to handle water/glycol mixtures commonly used in hydronic systems — making it a reliable choice for residential and light to medium-commercial installations.
Key Features
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7.8 gallon capacity (6.3 gal acceptance volume): Generous volume for expansion compensation in medium-size hydronic circuits.
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ASME-rated construction: Designed to comply with ASME Section VIII Division I standards, providing confidence in safety and pressure integrity.
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Fixed-diaphragm carbon-steel shell: Heavy-duty butyl diaphragm inside a carbon-steel vessel — built to withstand thermal expansion and fluid pressure over long service life.
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Pre-charged & ready to install: Ships pre-charged (typical 40 PSI) for immediate setup; compatible with water or water/glycol systems.
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Reliable operating limits: Rated for up to 150 PSI working pressure (for ZETA-15 thru ZETA-60 models) and up to 240 °F max temperature — suitable for most hydronic heating or cooling applications.
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Flexible installation orientation: Can be mounted vertically or horizontally depending on space and mechanical-room configuration.
