AMTROL Therm-X-Trol Expansion Tank-ST-5 at The Home Depot


Model # ST-5

Internet # 202268963

Store SKU # 979936

Therm-X-Trol Expansion Tank

AMTROL Therm-X-Trol Expansion Tank

This item has been discontinued.
The Home Depot no longer carries this specific product.

$60.52 / each


Model # ST-5

Internet # 202268963

Store SKU # 979936

The Therm-X-Trol Expansion Tank can be used in a variety of places such as apartments, office buildings and hospitals. This expansion tank helps eliminate BTU and water waste. The tank helps protect the fixture and heater. This tank is easy to install.

  • Helps eliminate BTU and water waste
  • Helps protect heater and fixtures
  • Limits the system’s pressure buildup
  • Can be used in office buildings, apartments, hospitals and Laundromats
  • Easy to install

Info & Guides

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Accessory type  BOILER REPLACEMENT PART  Assembled Depth (in.)  8 in 
Assembled Height (in.)  13 in  Assembled Width (in.)  8 in 
Heating Product Type  Accessory  Manufacturer Warranty  5 YEAR 
Product Depth (in.)  8.25  Product Height (in.)  13.25 
Product Weight (lb.)  4.25 lb  Product Width (in.)  8.25 
Returnable  90-Day 


Rated 4.9 out of 5 by 10 reviewers.
Rated 5 out of 5 by Seems solid Bought an expansion tank in-store and read reviews on the product after the fact. Appeared to be a less quality product. Came across the Therm-X tank and the reviews were much better. So I ordered this online and had it shipped to my home. Product came as advertised and arrived early. I did try to just hand tighten tank because I didn't have a 12' crescent wrench. It leaked. Once I got the wrench and tightened it down it worked as expected. January 30, 2014
Rated 5 out of 5 by Easy to install, received sooner than projected. The expansion tank was easyto install. It arrived ahead of the scheduled timeframe. The one that was being replaced had been in service for more than ten years so it seemed to have performed for a reasonable period of time October 21, 2014
Rated 4 out of 5 by Easy to install, resolved my problem ... I purchased this product because it was an exact replacement for the original expansion tank installed in my home. The original tank lasted approx. 8 years before it began to fail. I wasn't sure what my problem was at first. I only knew that I had increased water pressure at my residence. After ruling out several other possibilities I turned my attention to the expansion tank. Following the manufacturers instructions (and some youtube videos) I was able to easily replace my old tank with this new one. My pressure problems were resolved immediately. I couldn't be happier - largely because I didn't have to pay a plumber to make the repair. March 12, 2013
Rated 5 out of 5 by Won't leak the way cheaper expansion tanks can. This was a replacement of same model. Don't take chances with cheaper expansion tanks...these won't leak from corrosion, even in a muggy Florida garage. Check the pressure at least once a year, or the bladder will tear like my old one fault. Fast, easy to install. Match the air pressure to the water inlet pressure, check it annually, and it should last indefinitely. Use "Rector Seal 5" pipe thread sealant and two wrenches, hand tighten, and you're done. Total job, including old expansion tank removal, 10 minutes. April 30, 2013
Rated 5 out of 5 by No issues so far I don't think my review will be very helpful. I just want to mention following things: - delivery was quick - I did not have any issues to install it. I had to cut main line and put in place only one connector. I did not have to do anything extra. - When I checked pressure it was a bit less than 40 psi so make sure you check yours before installation - It's been only 1 month since I installed it, and so far it seems to be working fine April 15, 2014
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