The Wilkins XT-35 is a 35-liter water thermal expansion tank designed to protect potable water systems from pressure increases caused by thermal expansion in water heaters.

Key Specifications:

• Tank Volume & Acceptance Volume: 9.0 gal capacity, 4.25 gal acceptance
• Maximum Supply Pressure: 80 PSI maximum
• Pre-charge Pressure: 40 PSI factory setting
• Notable Certifications: NSF/ANSI 61 & 372
• Connection Type: 3/4 Inches NPT threaded

Other Related Variants:

• XT-8: 8 liter (2.1 gal) capacity version
• XT-18: 18 liter (4.8 gal) capacity version

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 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; ANSI B1.20.1

Features & Benefits:

• Thermal Expansion Protection: Absorbs excess pressure when water heats, preventing relief valve discharge and system damage.
• Durable Construction: Carbon steel shell with polypropylene liner prevents water contact with metal, extending service life.
• NSF Certified Safety: Meets NSF/ANSI 61 and 372 standards for safe drinking water contact and lead-free compliance.
• Adjustable Pre-charge: Factory 40 PSI setting can be adjusted on-site to match system pressure requirements up to 80 PSI.

FAQ

Q: What size water heater does the Zurn XT-35 support?

A: Based on the sizing chart, the Zurn XT-35 is suitable for water heaters ranging from 100 to 200+ gallons at 80 PSI supply pressure, or 60 to 200+ gallons at lower pressures, assuming a 100°F temperature rise.

Q: How do I adjust the pre-charge pressure on this tank?

A: The tank includes a standard tire valve (0.301"-32 charging valve connection) that allows you to adjust the pre-charge pressure using a standard air pump. Adjust only when no water pressure is in the tank, and set to match your incoming water pressure.

Q: Can the Wilkins XT-35 be used with high-temperature water systems?

A: Yes, while certified to NSF 61 for domestic hot water, the XT-35 is suitable for temperatures up to 200°F. However, it is not suitable for use on fire sprinkler systems as required by NFPA 13 or 13D.

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