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Internet # 204079272

Model # XT-18

Store SO SKU #1000831963

18 l Lead-Free Potable Water Thermal Expansion Tank

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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
  • View More Details
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Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

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.

Highlights

  • 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
     see Prop 65 WARNINGS

Product Information

Internet # 204079272

Model # XT-18

Store SO SKU #1000831963

Specifications

Dimensions: H 10.5 in, W 11 in, D 11 in

Dimensions

Product Depth (in.)

11 in

Product Height (in.)

10.5 in

Product Width (in.)

11 in

Details

Application

Potable Water

Compatible Brand/Model

Zurn Industries

Finish Family

White

Material

Carbon Steel

Nominal Tank Capacity (gallons)

5 gal

Pack Size

1

Product Weight (lb.)

10 lb

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

All goods sold hereunder are warranted to be free from defects in material and factory workmanship for a period on one year from date of purchase.

Questions & Answers

5Questions
caret
Q:can this be used horizontally and can it be a replacement for a 5 gallon reliance ETC-5x?
by|Dec 14, 2021
1 Answer
Answer This Question

A:  Yes, this expansion tank can be used horizontally, as most can. Yes, it can be a replacement for another 5 gallon expansion tank. Technically, this is a 4.8 gallon expansion tank, according to the specs.

by|Feb 21, 2024
    caret
    Q:Will this expansion tank support a 50 Gallon Water Heater?
    by|Feb 11, 2021
    1 Answer
    Answer This Question

    A:  Yes, this expansion tank will support a 50 gallon water heater. This expansion tank is a 4.8 gallon expansion tank and under the correct conditions, support up to 80 gallon water heaters. Use an online calculator to determine the size of the tank needed.

    by|Feb 21, 2024
      caret
      Q:replacing a 7.5gal tank
      by|Mar 11, 2018
      4 Answers
      Answer This Question

      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|May 5, 2023

          A:  The capacity is 4.8 gallons.

          by|May 5, 2023

            A:  No, this tank will not replace a 7.5 gallon expansion tank. This expansion tank is a 4.8 gallon tank. You would need a larger tank, or you could use an online calculator to determine size of tank for your application.

            by|Feb 21, 2024
              caret
              Q:Are these tanks made in the USA?
              by|Mar 5, 2017
              2 Answers
              Answer This Question

              A:  No - tank says "Made in Taiwan" on the label.

              by|Mar 8, 2024
                2 found this answer helpful

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

                by|Mar 8, 2024
                  3 found this answer helpful
                  Showing 1-4 of 5

                  Customer Reviews

                  5 out of 5

                  • 5 out of 5 reviews
                  • 100% recommend this product
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                  Showing 1-5 of 5 reviews
                  Quality
                  This is easy to install. With the stainless steel connector, you just hook up a flex water supply line. I also used the mounting kit that you can get separately. Easy. Taht's the best. I appreciate the quality. Expensive, but worth it.
                  by
                    • Recommended
                    Don't drink from your hose
                    I recently replaced a 24-year-old gas water heater in Montgomery County, MD. Based on newer laws and codes, I had to add this expansion tank and a new pan to the cost of installation. Obviously, these are unnecessary items since the last water heater worked perfectly without them. Luckily, I was able to replace my old gas heater with a new one before the nanny state outlawed them. The reason I chose this tank over others is because it is made of steel, epoxy coating, stainless steel, plastic liner and rubber rated for potable water use. I would have preferred a stainless steel or glass interior lining for safety. Coatings, plastic and rubber decay. That decay over time will probably enter my potable water supply.
                    by
                      • Recommended
                      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.
                      by
                      • Verified Purchase
                      • Recommended
                      5 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
                      by
                      • Verified Purchase
                      Showing 1-5 of 5 reviews