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Wilkins XT-8 Thermal Expansion Tank, 2.1 Gal (3/4 NPT)

Wilkins XT-8 Thermal Expansion Tank, 2.1 Gal (3/4 NPT)

Brand: Zurn Industries, LLC
Save 25%
$95.82
$71.86
SKU XT-8

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The Wilkins XT-8 thermal expansion tank protects residential potable hot water systems from pressure increases caused by thermal expansion. With a compact 2.1 gallon (8 L) tank volume and 1.0 gallon acceptance, the XT-8 is designed for installation on the potable water line between a backflow preventer or pressure reducing valve and the water heater.

  • Capacity: 2.1 gallons (8 L) total volume; approximately 1.0 gallon acceptance volume.
  • Connection: 3/4-inch MNPT inlet/outlet for standard residential hookups.
  • Construction: Epoxy-coated carbon steel shell with polypropylene inner lining and stainless steel connection.
  • Diaphragm & Air Charge: Butyl rubber diaphragm; factory pre-charged to 40 PSI and adjustable for system requirements.
  • Ratings: 200°F maximum temperature rating; 80 PSI typical maximum supply, 150 PSI maximum allowable working pressure.
  • Dimensions & Warranty: Approximately 8" diameter x 10.5" height; lightweight for easy mounting; backed by a manufacturer warranty.

Built to meet potable water standards and lead-free requirements, the XT-8 reduces the risk of relief valve cycling and pressure-related damage by absorbing expanded water volume. Its polypropylene-lined chamber and butyl diaphragm resist corrosion and maintain reliable performance in domestic hot water systems. For best results, mount the tank on the cold-water line between the pressure-reducing device or backflow preventer and the water heater, follow the included installation instructions, and verify the pre-charge matches your system pressure before commissioning.

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Frequently Asked Questions

What residential systems is the XT-8 designed for?
Designed for residential potable hot water systems; 2.1 gal tank with about 1.0 gal acceptance handles typical thermal expansion.
How and where should I install the XT-8?
Install on the cold potable line between a backflow preventer or pressure-reducing valve and the water heater; use the 3/4" MNPT connection and follow instructions.
Does the XT-8 need maintenance or pre-charge checks?
Factory pre-charged to 40 PSI; check pre-charge periodically and adjust to match system pressure; inspect for leaks and follow the manual for service.

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