Water Heater Expansion Tank


Capacity in gallons:
2 gallon
4.5 gallon

Precharge pressure in PSI: 
25 PSI

Discharge connection:
3/4 in. NPT

Connector material:
Stainless steel 304


Suplumb Water heater thermal expansion tank is designed and manufactured complying with UPC and NSF requirements.

Passed all IAPMO test and paint adhesion test (ASTM D3359, ISO/DIN 2409).

We also apply strict inspections as below:

  • 100% Air pressure test
  • 100% Visual inspection
  • Paint adhesion test for each batch

Technical parameter:

  • Pre-charge pressure :25 PSI
  • Max working pressure :  150 PSI
  • Max operating temperature : 200 F


Each tank includes two protective covers for air tap and water connector.

Individual packed in clear PE bag and box.


2 gallon - 500 pcs

4.5 gallon - 300 pcs

Lead time: 

Within 45 days, but we do have stock sometimes for direct shipping.

About sample:

Samples are available, but due to the air transportation restriction on the sealed tank, most express are not available.

We here promise to our customers that this tank is UPC and NSF certified, it is designed and manufactured for portable water lines pressure buffering, perfectly match for use in USA and Canada.

A trial order of small quantity is available.

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