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Water Worker Amtrol 2 gal Water Heater Expansion Tank

Absorbs the pressure of expanding hot water so your pipes and heater don't take the hit.
Water Worker MPN G-5W In Stock & Ready to Ship
$64.99
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

This 2-gallon expansion tank from Water Worker (a sub-brand of Amtrol) takes the pressure off your water heater system - literally. As water heats up, it expands, and without somewhere for that extra volume to go, you get stress on pipes, fittings, and the heater's tank. This unit gives that expanding water a place to sit, protecting your system from pressure spikes. The steel shell and polypropylene lining stand up to hot water, and the 3/4" MPT connection makes it a straightforward add to most residential setups.

  • Capacity: 2 gallons
  • Material: steel tank with polypropylene lining
  • Connection: 3/4" MPT, male
  • Maximum temperature: 200°F
  • UL Listed
  • Color: white

The Details Specifications

Ships Ground Travels by ground for safe handling — common for items with a lithium battery, aerosol, or liquid inside. Nothing extra to do on your end; it simply ships by truck instead of by air.
Brand Water Worker
Model / MPN G-5W
UPC 014045466523
Weight 5 lbs
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Water Worker. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Water Worker

Or skip the tabs entirely and buy it down the street. Find a store near you →

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Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
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Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

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