The Wilkins XT-8 is a water thermal expansion tank designed to protect potable water systems from pressure buildup caused by thermal expansion, keeping system pressure below relief valve settings.

Key Specifications:

• Tank Volume & Acceptance Volume: 2.1 gal total, 1.0 gal max acceptance
• Maximum Supply Pressure: 80 PSI
• Pre-charge Pressure: 40 PSI factory preset
• Notable Certifications: NSF/ANSI/CAN 61 & NSF/ANSI 372
• Connection Type: 3/4 NPT threaded

Other Related Variants:

• XT-18: 4.8 gallon version, 2.4 gal acceptance volume
• XT-35: 9.0 gallon version, 4.25 gal acceptance volume

Materials:

• Carbon Steel outer shell with epoxy finish
• Polypropylene liner
• Butyl rubber diaphragm
• Stainless steel connection

Typical Installation:

Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be mounted on the cold water supply and at least 18 inches from the cold water inlet to the heater. Pre-charge should be adjusted to match incoming water pressure (adjust pre-charge with no water pressure in tank). A properly sized pressure relief valve set at a maximum of 150 PSI must also be installed in the system. For installations that have a supply pressure above 80 PSI, a properly sized pressure reducing valve should be installed on the system.

Standards Compliance:

IAPMO Listed; Water Quality Association - Certified to NSF/ANSI/CAN 61 & NSF/ANSI 372; ANSI B1.20.1

Features & Benefits:

• Thermal Expansion Protection: The Zurn XT-8 protects water systems from pressure buildup when water heats and expands, preventing relief valve activation and potential system damage.
• Safe for Potable Water: The Zurn XT-8 features a polypropylene liner and butyl diaphragm certified to NSF/ANSI/CAN 61 & 372, ensuring safe contact with drinking water with 0.25% max weighted average lead content.
• Adjustable Pre-charge: Factory set at 40 PSI but adjustable up to 80 PSI to match specific system requirements, providing flexible installation options for various pressure conditions.
• Durable Construction: Carbon steel shell with epoxy finish and stainless steel connection ensures long-lasting performance in residential and commercial applications up to 200°F.

FAQ

Q: How do I determine the correct pre-charge pressure for my system?

A: The pre-charge should be adjusted to match incoming water pressure. Adjust pre-charge with no water pressure in the tank using the standard tire valve connection.

Q: Where should the expansion tank be installed in relation to the water heater?

A: The assembly should be mounted on the cold water supply and at least 18 inches from the cold water inlet to the heater, unless local codes specify otherwise.

Q: Can this expansion tank be used on fire sprinkler systems?

A: No, Model XT tanks are not suitable for use on fire sprinkler systems as required by NFPA 13 or 13D.

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