Resideo by Honeywell TX-5 2 Gallon Thermal Expansion Tank

The Resideo by Honeywell TX-5 is a 2-gallon thermal expansion tank designed to protect closed-loop water heating systems from excessive pressure buildup. When water is heated, it expands, and without proper expansion accommodation, this can lead to dangerous pressure levels, potential relief valve discharge, and premature system failure. This expansion tank provides a critical safety buffer by absorbing excess water volume.

Key Features:

• 2-gallon capacity suitable for residential water heaters up to 50 gallons
• 3/4-inch NPT threaded connection for standard installation
• Pre-pressurized diaphragm design separates water from air charge
• Durable steel construction with corrosion-resistant finish
• Helps prevent pressure relief valve weeping and extends system life
• Complies with thermal expansion requirements in closed plumbing systems

This expansion tank is essential in homes with backflow preventers, check valves, or pressure-reducing valves that create a closed system. The butyl diaphragm prevents waterlogging and maintains consistent pressure regulation throughout the tank's service life. Installation is straightforward using the 3/4-inch threaded connection, typically mounted on the cold water supply line near the water heater.