NOTICE: Product images may vary from the actual item due to differences in size or configuration options.

The Wilkins XT-18 is a water thermal expansion tank designed to protect potable water systems from pressure buildup caused by thermal expansion in water heaters.

Key Specifications:

• Tank Volume & Acceptance Volume: 4.8 gallons total; 2.4 gallons acceptance
• Maximum Supply Pressure: 80 PSI maximum
• Factory Pre-charge Pressure: 40 PSI adjustable
• Notable Certifications: NSF/ANSI/CAN 61 & NSF/ANSI 372
• Connection Type: 3/4 Inches NPT threaded

Other Related Variants:

• XT-8: 2.1 gallon capacity version (8 liter)
• XT-35: 9.0 gallon capacity version (35 liter)

Materials:

• Carbon steel outer shell
• Epoxy finish coating
• Stainless steel connection
• Polypropylene liner
• Butyl rubber diaphragm

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). Maximum allowable pre-charge in this expansion tank is 80 PSI. 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 (0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)

Features & Benefits:

• Thermal Expansion Protection: The Zurn XT-18 protects water systems by absorbing thermal expansion from water heaters, keeping pressure below relief valve settings.
• Durable Construction: Features a polypropylene liner that prevents water contact with the steel interior and FDA-approved butyl rubber diaphragm for long-lasting performance.
• Lead-Free Certified: Meets NSF/ANSI 372 low-lead requirements, ensuring safe potable water contact for residential and commercial applications.
• Adjustable Pre-Charge: Includes standard tire valve connection for on-site charging adjustment to match specific system pressure requirements up to 80 PSI.

FAQ

Q: What size water heater is the Zurn XT-18 suitable for?

A: The XT-18 is appropriate for water heaters ranging from 40 to 120 gallons depending on supply pressure conditions, based on a 100°F temperature rise.

Q: Can the factory pre-charge pressure be adjusted after installation?

A: Yes, the XT-18 features a 0.301"-32 charging valve connection (standard tire valve) that allows adjustment of pre-charge pressure on-site with no water pressure in the tank.

Q: Where should the thermal expansion tank be installed in the system?

A: The tank should be mounted on the cold water supply line between the backflow preventer or pressure reducing valve and the water heater, at least 18 inches from the cold water inlet to the heater.

"Hydrate Everyone, Everywhere!" BottleFillingStations.com | Contact us