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Written from the listing's specs, not from our own use · How we rate
4.5 gallons of expansion room and a 12 PSI pre-charge: the Watts ETX-30 Expansion Tank (4.5 gal) covers what matters most in an expansion tank. It makes most sense for a relief valve that keeps dripping; we rate it 7.0/10 from its listing.
| Brand | Watts |
|---|---|
| Category | Service kits, valves & parts |
| Connection | 1/2" MNPT |
| Pre-charge | 12 PSI |
| ASIN | B0086DDNEI |
Full listing title: Watts ETX-30 4.5 Gal Carbon Steel Expansion Tank Hydronic Heating 75psi
Rated from the listing's specs, no buyer reviews yet
What it's made for: a relief valve that keeps dripping.
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 12 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 4.5 gallons, per the listing.
Maybe not, on an open system. Local codes differ, so your plumber has the last word.
What the Watts ETX-30 Expansion Tank (4.5 gal) listing names:
Hold the figures against your own heater and its manual before you order.
We have no recent price on file for this listing, so we don't print an old one.
The button opens the exact listing (ASIN B0086DDNEI), where today's price, stock and seller apply.
Our take
What we'd buy the Watts ETX-30 Expansion Tank (4.5 gal) for is 4.5 gallons of expansion room, with a 12 PSI pre-charge as a bonus. No buyer reviews yet, so this Watts expansion tank has to win you over on paper. The catch with the Watts: 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 PEVEPEXE Expansion Tank (2.1 gal) first.
Before you order the Watts ETX-30 Expansion Tank (4.5 gal), check your water pressure: it holds 4.5 gallons and ships at 12 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 4.5 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 12 PSI. Match the air charge to your house water pressure before it goes on the line.
How the Watts ETX-30 Expansion Tank (4.5 gal) stacks up against the closest alternative, the PEVEPEXE Expansion Tank (2.1 gal).
| Criterion | Watts ETX-30 Expansion Tank, 4.5 gal | PEVEPEXE Expansion Tank, 2.1 gal |
|---|---|---|
| Our rating | 7.0/10 | 7.3/10 |
| Size | 4.5 gal | 2.1 gal |
| Rating | 12 PSI pre-charge | 40 PSI pre-charge |
Pick the PEVEPEXE Expansion Tank (2.1 gal) if you want our higher-rated option (7.3/10).
We rate it 7.0/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states 4.5 gallons of expansion room and a 12 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 4.5 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 12 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.