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Model #XT-18

Store SO SKU #1000831963

18 l Lead-Free Potable Water Thermal Expansion Tank

$13026
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  • Used for thermal expansion protection in residential applications
  • Features a stainless steel connection to resist corrosion
  • Field adjustable pre-charge allows for easy maintenance
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Product Details

The 4.8 gallon XT-18 Thermal Expansion Tank is utilized on potable water lines between the backflow preventer or pressure reducing valve and the water heater for protection against water thermal expansion in residential applications. As the system pressure increases, water enters the polypropylene-lined water chamber of the tank, expanding a diaphragm into a pre-charged air chamber to keep the system pressure below the relief valve setting. Materials include a carbon steel shell with an epoxy finished coating, and corrosion-resistant stainless steel connection with a polypropylene liner and Butyl rubber diaphragm.
  • Pre-charge is field adjustable for convenient maintenance
  • Carbon steel shell with polypropylene liner ensures long-lasting construction
  • Diaphragm style tank is ideal for thermal expansion protection in residential applications
  • Stainless steel connection resists corrosion
  • Low-lead law compliant
  • IAPMO Listed
  • Water Quality Association - Certified to NSF/ANSI 61 & 372
  • Water chamber is polypropylene lined
  • Diaphragm is made of butyl rubber
  • Easy to install
  • Return Policy
  • California residents

Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

5Questions
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Q:can this be used horizontally and can it be a replacement for a 5 gallon reliance ETC-5x?
by|Dec 14, 2021
0 Answer
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Q:Will this expansion tank support a 50 Gallon Water Heater?
by|Feb 11, 2021
0 Answer
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Q:what volume of water does it hold
by|Mar 11, 2018
3 Answers
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A:  The XT-18 tank capacity is 4.8 gal or 18 Liters. The XT-18 can handle up to a 175 gal water heater capacity at 130 deg F. The manufacturer recommends installation of the XT upstream of the water heater(s) on the cold water line.

by|Oct 1, 2019

    A:  The tank has a bladder in it & the bladder's air pressure is supposed to be set to one's normal water pressure. If one's water pressure raises, some water enters the tank and compresses the bladder. Zurn-Wilkins specifications for the XT-8 says tank volume 2.1 gallons & maximum acceptance volume 1.0 gallons, XT-18 says tank volume 4.8 gallons & maximum acceptance volume 2.4 gallons, & XT-35 says tank volume 9.0 gallons & maximum acceptance volume 4.25 gallons. All three have a maximum working pressure of 150psi

    by|Jun 27, 2018

      A:  The capacity is 4.8 gallons.

      by|Mar 12, 2018
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        Q:Are these tanks made in the USA?
        by|Mar 5, 2017
        2 Answers
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        A:  No - tank says "Made in Taiwan" on the label.

        by|May 3, 2020
          1 found this answer helpful

          A:  No, label indicates the XT-18 is manufactured in Taiwan.

          by|May 3, 2020
            1 found this answer helpful
            Showing 1-4 of 5
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            Customer Reviews

            5 out of 5
            (3)
            • 5
              out of 3 reviews
            • 100%recommend this product
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            Showing 1-3 of 3 reviews
            Was how the vender data described it. Appears to be a good tank - made well.
            Was how the vender data described it. Appears to be a good tank - made well.
            by
            • Verified Purchase
            • Recommended
            Solves thermal expansion pressure problems & is code required. I once lived in a community where...
            Solves thermal expansion pressure problems & is code required. I once lived in a community where the simple water system consisted of a water tank on the top of a hill. If one was near the top of the hill, a pump was required to take a decent shower; if one was at the bottom of the hill, like me, the line pressure varied from 150 to 180 psi depending on how deep the water was in the tank. Modern plumbing systems are designed for 40-60 psi, so every body at the bottom of the hill had pressure regulators. Pressure regulators are also check valves - water can't flow back thru them. So if everybody takes a hot shower in the morning & heads off to work & school, the water heater heats cold water, expanding it & completely defeating the pressure regulators purpose. This thermal expansion tank solves that problem. It has a bladder in it that fails eventually, but my experience with the Zurn-Wilkins is that they last a long time & I'm a happy user.
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            • Verified Purchase
            • Recommended
            3 found this review helpful
            My old tank was 10 years old and looked...
            My old tank was 10 years old and looked a little different from the new one ,I was concerned it wouldn’t fit but it worked perfectly
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            Showing 1-3 of 3 reviews

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