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Written from the listing's specs, not from our own use · How we rate
If you're after 2.1 gallons of expansion room, the GE Expansion Tank (2.1 gal) delivers, with a 40 PSI pre-charge on top. A good match for a closed system with a check valve or a pressure regulator, rated 6.8/10 on its documented specs.
| Brand | GE |
|---|---|
| Category | Service kits, valves & parts |
| Connection | 3/4" MNPT |
| Pre-charge | 40 PSI |
| ASIN | B0GWFCJ5KR |
Full listing title: GE Appliances Water Heater Expansion Tank – 2.1 Gallon, Pre-Charged 40 PSI, 3/4" MNPT Connection, Max Temp 200°F – Helps Protect Plumbing System
Rated from the listing's specs, no buyer reviews yet
What it's made for: a closed system with a check valve or a pressure regulator.
Two expansion tanks close to it on our rating, each with a dated price.
The size the listing states. On a closed system it takes up the water that expands as it heats; set the air charge to your house pressure with a tire gauge before it goes on.
What it has going for it
Pre-charged to 40 PSI. Set the air charge to match your house water pressure before it goes on; a tire gauge does the job.
Yes, if your house has a check valve or a pressure regulator at the meter: that makes it a closed system, and expanding hot water needs somewhere to go. This one holds 2.1 gallons, per the listing.
Maybe not, on an open system. Local codes differ, so your plumber has the last word.
The seller states, word for word, in the GE Expansion Tank (2.1 gal) listing:
Factory pre-charged to 40 PSI with a maximum charge of 80 PSI for reliable operation.
Designed to withstand temperatures up to 200°F for use with residential water heaters.
Standard 3/4" MNPT fitting allows for quick connection to compatible plumbing systems.
Quoted from the listing, not checked by us. Hold every figure against your own heater before you order.
What the GE Expansion Tank (2.1 gal) listing names:
Check these figures against your heater's manual before you order.
On Sep 30, 2026, that price put it in the pricier third of the 6 expansion tanks we have a recent price for.
The button opens the exact listing (ASIN B0GWFCJ5KR), where today's price, stock and seller apply.
A bigger system? The Watts ETX-30 Expansion Tank, 4.5 gal (7.0/10) holds 4.5 gallons.
Our take
We like the GE Expansion Tank (2.1 gal) for 2.1 gallons of expansion room and a 40 PSI pre-charge. No buyer has reviewed it yet, so our 6.8/10 comes from the spec sheet alone. The catch with this GE expansion tank: the air charge has to be set to your house pressure first, or it does little. We'd pick it if your plumbing has a check valve or a pressure regulator; otherwise, put it next to the Watts ETX-30 Expansion Tank (4.5 gal) first.
Before the GE Expansion Tank (2.1 gal) goes in your cart, check your water pressure: it holds 2.1 gallons and ships at 40 PSI, and the air charge has to match your house pressure.
Usually yes when there is a check valve or a pressure regulator at the meter; your plumber or local code decides.
It holds 2.1 gallons. The tank size follows your water pressure and the volume of hot water in the system; small residential systems often use the 2-gallon class.
It ships at 40 PSI. Match the air charge to your house water pressure before it goes on the line.
How the GE Expansion Tank (2.1 gal) stacks up against the closest alternative, the Watts ETX-30 Expansion Tank (4.5 gal).
| Criterion | GE Expansion Tank, 2.1 gal | Watts ETX-30 Expansion Tank, 4.5 gal |
|---|---|---|
| Our rating | 6.8/10 | 7.0/10 |
| Size | 2.1 gal | 4.5 gal |
| Rating | 40 PSI pre-charge | 12 PSI pre-charge |
Pick the Watts ETX-30 Expansion Tank (4.5 gal) if you want our higher-rated option (7.0/10).
We rate it 6.8/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states 2.1 gallons of expansion room and a 40 PSI pre-charge. These are the seller's figures, not our measurements: whether it fits your exact heater is worth confirming first.
Do you need one: usually yes when there is a check valve or a pressure regulator at the meter; your plumber or local code decides. Size: it holds 2.1 gallons. The tank size follows your water pressure and the volume of hot water in the system; small residential systems often use the 2-gallon class. Air charge: it ships at 40 PSI. Match the air charge to your house water pressure before it goes on the line.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.