4 Gallon Residential Reverse Osmosis Water Storage Tanks

4.7 (81)
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Product details

Web ID: 18875673
APEC WATER SYSTEMS TANK-4 provides dependable water storage for residential reverse osmosis systems. Its durable metal tanks ensure continuous, stable supply of purified water at fast flow rates, suitable for average to large families.

  • Product Features

    • Tank ball valve is sold separately
    • Pre-pressurized 4 gallon water storage tank (holds up to 3.2 gallon of water)
    • Discharge efficiently in a vertical or horizontal position with tank stand
    • Inlet/outlet connection: 1/4 inch male pipe thread. Special designed for ro application
    • 30-Day Return Guarantee
    • Imported

  • Shipping & Returns

    • This item qualifies for Free Shipping with minimum purchase! exclusions & details
    • Our Normal Gift Boxing is not available for this item.
    • This item may not be shipped to Alaska, U.S. Virgin Islands, Hawaii, Northern Mariana, Guam, Marshall Islands, Federated States of Micronesia, American Samoa, Puerto Rico, Palau
    • This item may not be shipped to Alaska, American Samoa, Guam, Hawaii, Marshall Islands, U.S. Virgin Islands, Puerto Rico, Palau, or the Pacific Islands.
    • California and Minnesota customers call 1-800-289-6229 for Free Shipping information.
    • For complete details, see our Shipping and Returns policies.

Ratings & Reviews

Here's what customers think
  • The water storage tank is generally well-received, with customers reporting it was easy to install and helped restore their system's performance.
  • However, some note the tank's lifespan is relatively short, with the bladder or air pressure failing after 4-8 years.
  • While affordable, it may not provide the best long-term value compared to other options.
  • Customers should be aware of the tank's limited durability and plan to replace it every 5-8 years as needed.
AI-generated summary from 81 customers reviews.
4.7/5

81 star ratings & reviews

Write a Review
82.7% of reviews have 5 stars
67
6.2% of reviews have 4 stars
5
7.4% of reviews have 3 stars
6
3.7% of reviews have 2 stars
3
0.0% of reviews have 1 star
0
81 reviews
James M.
10 days ago

First tank lasted 10 years

The first 4 gallon tank that I purchased with my under sink water system from Apex has lasted a decade. I noticed that it was losing pressure so I used my air compressor to add some air and so far it is still holding up, but I purchased a second tank so it would be ready to go when my first tank finally gives up the ghost.

Customer review from www.apecwater.com

Jo F.
4 months ago

Easy to replace!

No problems. Just got to make sure you depressurize it before you disconnect it.

Customer review from www.apecwater.com

Mark S.
7 months ago

4 gallon replacement tank

It all worked perfectly even though it came with no instructions.

Customer review from www.apecwater.com

David Q.
8 months ago

It works

The connector part on the new tank is shorter than the original version, but I managed to install it without any leaking, so I guess it's OK.

Customer review from www.apecwater.com

Odin O.
9 months ago

Great tank

Very happy with this replacement tank. Easy to install and has worked out great.

Customer review from www.apecwater.com

Jeffrey P.
9 months ago

Our third tank. Both the

Our third tank. Both the original tank and first replacement lasted 5 to 6 years each. Nothing glamorous. It does the job and is easy to swap out.

Customer review from www.apecwater.com

Clara U.
11 months ago

The tank worked just fine.

The tank worked just fine. The original one lasted around 4 years. I guess that's normal. Either way it's cheaper than bottled water and it omits all the wasted plastic. The people at Apec were very helpful in helping us determine why the original one was just trickling. Thank you

Customer review from www.apecwater.com

Katherine F.
11 months ago

Replacement tank is perfect

So glad I was able to replace my old (original) tank, which was starting to have bladder problems and kept just dumping water into the drain line. Beautifully packaged, easy to replace, peace of mind! There is a protocol to repressurize the old tank, so I may try that with the old tank as a back-up, but the replacement tank was available at a sale price and is worry-free.

Customer review from www.apecwater.com