Home > Air Elimination

Watts ETX Heating & Cooling Expansion Tanks


Series ETX tanks are designed for use in closed-loop hydronic heating systems to absorb the increased volume of water created when water is heated. These tanks maintain system pressure below the relief setting of the relief valve. The Series ETX's pre-pressurized steel tank features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged diaphragm minimizes loss of the air charge and ensures a long and trouble-free life for the system. Maximum pressure of the ETX tanks is 75psi.

PDF Documents:
Watts ETX Brochure | Watts ETX Installation Guide

↓   Watts Expansion Tanks   ↓

2.1 gallon expansion tank

Part No: ETX-15

$128.23 each

4.5 gallon expansion tank

Part No: ETX-30

$153.18 each

6.0 gallon expansion tank

Part No: ETX-60

$158.80 each

15.0 gallon expansion tank

Part No: ETX-90

$320.34 each

20.0 gallon free-standing expansion tank

Part No: ETSX-40

$418.51 each

33.0 gallon free-standing expansion tank

Part No: ETSX-60

$750.00 each

44.0 gallon free-standing expansion tank

Part No: ETSX-90

$1250.76 each

Galvanized steel DWV saddle clamp

Part No: 523-1

$1.89 each
↓   Expansion Tank Straps   ↓

Expansion Tank Kit - Maximum diameter 10"

Part No: 598-0210

$9.54 each
$90.63 (10 x $9.06)

Expansion Tank Kit - Maximum diameter 13".

Part No: 598-0213

$13.60 each
$129.21 (10 x $12.92)