Watts 2.1 Gal. 1/2 in. IPS Hydronic Expansion Pressure Tank, Model #ETX-15

Item # 443911 | Watts Part # 0066605 | UPC Code 098268219340 | UNSPSC Code 40140000 | Catalog Page #822
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Product Overview

This non-potable water expansion tank is designed for use in commercial and residential closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. This carbon steel tank is pre-charged at 12 PSI, tank volume is 2.1 gallons and features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged butyl diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. This tank is made of carbon steel with epoxy finish, mounts to supply piping, 1/2 inch MNPT system connection and a 0.302-32 inch charging valve connection (standard tire valve) to facilitate on-site charging of the tank to meet system requirements. The maximum working pressure is 75 PSI (5.3 BAR).

  • Precharged to 12 psi
  • Rugged flexible butyl diaphragm
  • Inline and free standing models
  • Steel construction


Design Orientation
8 in.
12.5 in.
Manufacturer Warranty
1 year
Maximum Volume
1 Gal.
Pack Size
Product Depth (in.)
Product Diameter (in.)
Product Height (in.)
Product Weight (lb.)
Product Width (in.)
Tank Capacity
2.1 Gal.


1 year

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