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4.5 Gallon Thermal Expansion Tank for Residential Water Heaters

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“The vacuum breaker on my outdoor spigot failed and Noel's Plumbing was the only placeI could find that had the appropriate mfr. part. I sent a text with photos on Wednesday evening to make sure the part I found was correct. In less than 2 hours later, I had a reply confirming it was the correct part. Placed my order that evening and received the part on Saturday afternoon (about 2.75 days) and my plumbing issue was resolved! I highly recommend - I really appreciated the prompt and pleasant response. ”
-Kimberly S.
04/25/2026

$80.27

 

4.5 Gallon Thermal Expansion Tank

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, noelsplumbingsupply@fuse.net, or via the text widget on this screen.

SKU: 13935 Category:

4.5 Gallon Thermal Expansion Tank for Residential Water Heaters

 

The EASTMAN® thermal expansion tank prevents hot water from back flowing into the cold water line. This tank also prevents hot water from escaping through the pressure relief valve and onto the floor. The thermal expansion tank prevents constant fluctuations in water pressure that damage the heater.

 

  • 3/4″ MIP connection
  • Factory pre-charged at 40 PSI
  • 304 Stainless steel fittings
  • Butyle rubber diaphragm
  • 6-Year warranty
  • Helps guard against backflow
  • For 30 gal. – 160 gal.

 

 

Common questions about this product

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

Is this the correct item for my application? chevron-icon

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

 

We will make sure you have the right part.

 

 

chat iconWHAT OUR CUSTOMERS SAY…

“The staff knew exactly what I needed and where to find it. Quick in and out. ”
-Andre W.
06/15/2026