Model # ETX-15

Internet #100557223

Store SKU #222411

null Pre-Charged Non-Potable Water Expansion Tank

Pre-Charged Non-Potable Water Expansion Tank

$2999 /each
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Product Overview

With a maximum working pressure of 60 psi, the Watts ET15 Pre-Charged Non-Potable Water Expansion Tank is designed to absorb the increased volume of water created when a hot water boiler is heated. This pre-charged steel tank is easy to use and keeps system pressure below the relief setting of the relief valve.

California residents: see   Proposition 65 information

  • Equivalent capacity of 2.1 Gal.
  • For non-potable water systems
  • Controls hot water in closed loop heating systems
  • Keeps system pressure below the relief setting of the relief valve
  • Easy to use
  • Pre-pressurized, durable steel tank
  • Maximum working pressure of 60 psi
  • Maximum temperature of 240°F
  • Note: Product may vary by store.

Info & Guides

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Name Pre-Charged Non-Potable Water Expansion Tank 2 Gal. Pressurized Well Tank 4 Gal. Pressurized Well Tank 8 Gal. Pressurized Well Tank
Brand Water Worker Water Worker Water Worker
Ratings (2) (11) (8) (2)
Equivalent Capacity (gallons) 2.1 1 12 20
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Equivalent Capacity (gallons)
Product Depth (in.)
Product Diameter (in.)
11.9 in
Product Height (in.)
Product Width (in.)


Air Volume Control
Corrosion Resistant
Maximum inlet pressure (psi)
Mounting Bracket Included
Vertical / Horizontal
Pipe Size
3/4 in.
Pressure Relief Valve
Product Weight (lb.)
Pump Hookup Included
Tank Material

Warranty / Certifications

Manufacturer Warranty
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment.

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Customer Questions & Answers

How to install expansion tank

Asked by: Bigbart
A complete installation guide is able to be viewed here:
Answered by: CommunityAnswer
Date published: 2017-02-12

Watts ET90 Expansion Tank

Hi I'm looking to replace my home heating system expansion tank that is leaking. The leaking tank make is EX-TROL. The bottom ring has "30" at the top and pressure tested 150 psi. The measurements are 12.5" tall and 11" wide. It appears the connector is 3/4 inch. Would the Watts ET90 Expansion Tank be the right replacement for my old unit? And can you verify that the pipe is 3/4 inch?
Asked by: Anonymous
We will need the following information to respond to your question:: System Volume Supply pressure Relief valve set pressure Initial and end temperature
Answered by: WattsWater
Date published: 2015-09-20

i have a 40 gallon nat gas 40 000 btu. which expansion tank should i use?

Asked by: 1nuttybud

what is the psi on the tank when it is in operation an the watts tank is precharged at12psi

Asked by: Lewis
  • y_2017, m_8, d_18, h_14CST
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Customer Reviews

Pre-Charged Non-Potable Water Expansion Tank is rated 3.0 out of 5 by 2.
Rated 5 out of 5 by from Simple swap. I found out the hard way that this was not covered under public service boiler warranty. They wanted to charge a couple hundred to swap this part out. A trip to Home Depot and 20 minutes time and my boiler was back in service. worked perfect.
Date published: 2015-12-08
Rated 1 out of 5 by from Bad as in NOT Good The crimped seam on this in vulnerable to leakage. The seam on mine ruptured and flooded my heat room and basement below it. Get an expansion tank with a welded seam not a crimped seam. This thing caused considerable damage and expense.
Date published: 2014-09-12
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