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Watts ET-30 4.7 Gallon Potable Water Expansion Tank

SKU: 3148
   based on 1 Reviews
Save 43% · Retail: $104.47

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$59.08/ea 3
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About the Watts EXT-30

Series ET Non-Potable Water Expansion Tanks are for use in commercial and residential closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. The pre-pressurized steel tank features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. Available in a variety of models and sizes. Maximum Pressure: 60psi

Product Details

Product: Tank
Manufacturer: Watts
Use: Hydronic Heating
Style: Expansion Tank
Size: 4.7 Gallon
Connection Type: Threaded
Mpn # EXT-30
Weight 8.25 lbs.

Product Features

  • Hydronic Expansion Tank, 4.7 Gallon, 1/2 In Ips
  • Manufacturer: Watts Water Technologies
  • Manufacturer Part Number: etx-30


Rated 5 out of 5 based on 1 reviews

 Rated 5 by Robert A V.
WATTS ET-30 is exactly what was needed for my hot water boiler. Very easy to install and is reasonably priced! Thanks
Originally posted on Feb/2017

Questions & Answers


Hello! Thank you for visiting Our physical stores are located in Utah and Nevada but we can ship the product to you in Sioux City, Iowa. According to this Installation Manual (Figure 2), the Watts 1156F A-boiler fill valve is a good option for your Watts ET-30 expansion tank. If this is what you're looking for, order it now by contacting our Customer Service Department at 435-868-4020 or simply sending a message using the Contact Us tab found on the bottom right part of your screen. Happy shopping!


Howdy! Thank you for posting your question here on PlumbersStock concerning the Watts ET-30 Expansion Tank. No, they are not the same. You will be looking for shock arrester. Here are some hammer arrester you might need. Expansion tanks are designed to absorb excessive pressure for water being expanded by thermal conditions. Should you have further questions, let us know anytime. We thank you for choosing We are always happy to serve you!

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