Watts ETX30 Pressurized Expansion Tank

Watts ETX30 Pressurized Expansion Tank is an in-line expansion solution designed for reliable hydronic systems. This 4.5-gallon tank features an epoxy-coated carbon steel body, a rugged Butyl rubber diaphragm, and factory pre-charged air, delivering dependable operation up to 220°F and 75 PSI.

Ideal for commercial and residential closed-loop heating and cooling, the ETX30 mounts to supply piping with 1/2 in. male threaded connections. The factory pre-charged air (12 PSI) ensures quick installation and steady pressure balance across operating temperatures.

Built for durability, this Watts expansion tank withstands heating and cooling demands, with ISO 9001 certification and a 1-year warranty for peace of mind. It fits compact spaces with a design of 11" diameter by 14" height and integrates seamlessly into new or existing closed-loop hydronic systems.

• Capacity: 4.5 gallons | Dimensions: 11" diameter x 14" height
• Connections: 1/2" male threaded inlet/outlet
• Diaphragm: Rugged flexible Butyl Rubber
• Air charge: Factory pre-charged, 12 PSI
• Ratings: 220°F / 75 PSI
• Applications: Heating and cooling, commercial and residential closed-loop hydronic systems
• Quality: ISO 9001 compliant | Warranty: 1 year
• Mounting: Mounts to supply piping