928-074

The WATTS ETX-15 Expansion Tank is a critical safety and performance component designed for closed-loop hydronic heating systems. As water in a boiler system heats up, it expands; this diaphragm-type expansion tank provides the necessary space to absorb that increased volume, preventing dangerous pressure buildup. By maintaining consistent system pressure, it protects pipes, fittings, and boiler components from thermal expansion stress and potential leaks. Ideal for residential and light commercial heating applications, this durable tank features a high-grade steel shell and a flexible diaphragm that keeps the air charge separated from the system water, ensuring long-lasting performance and reducing the need for frequent maintenance. Use this expansion tank to improve the efficiency of your hot water heating system and safeguard your equipment against pressure-related damage.
Type: Hydronic Expansion Tank
Size: 4.5 Gallon Capacity
Dimensions: 11 inches × 11 inches × 12.625 inches
Application: Used in closed-loop hydronic heating systems, residential boilers, and hot water heating applications to control thermal expansion and regulate system pressure.
Specifications: Carbon steel construction; heavy-duty SBR diaphragm; maximum working pressure of 75 psi; factory pre-charge of 12 psi; 1/2-inch NPT threaded connection.