Resideo by Honeywell TK300-90 Expansion Tank 14 Gallon 1/2 NPT

The Resideo by Honeywell TK300-90 is a 14-gallon thermal expansion tank designed for closed-loop hydronic heating systems and potable water applications. This pre-pressurized expansion tank features a replaceable butyl diaphragm that separates the air chamber from the water, preventing corrosion and waterlogging while maintaining consistent system pressure.

Key Features:

• 14-gallon total volume capacity for residential and light commercial applications
• 1/2 inch NPT male threaded connection for easy installation
• Maximum working pressure of 100 PSI
• Maximum operating temperature of 240°F
• Durable steel construction with corrosion-resistant coating
• Pre-charged air chamber reduces installation time
• Replaceable diaphragm extends tank service life

This expansion tank absorbs excess pressure caused by thermal expansion in water heating systems, protecting plumbing fixtures, water heaters, and preventing relief valve discharge. The compact design allows for flexible mounting options in mechanical rooms, basements, or utility spaces.