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About Plumbing Expansion Tanks
Plumbing expansion tanks help manage pressure changes caused when water heats up inside a closed domestic water system. As a water heater raises the temperature, the water expands; a correctly sized thermal expansion tank gives that additional volume a place to go. This can help limit repeated pressure increases at fixtures, valves, and water heater connections.
At PlumbingSell, we carry compact tanks for water heater and appliance applications as well as larger thermal expansion options. Browse 2-gallon thermal expansion tanks, 2-gallon expansion tanks, and tankless expansion tanks to compare available configurations.
Choosing the Right Expansion Tank
Start by identifying the application: a storage water heater, tankless equipment, or another listed plumbing appliance. Tank size is not interchangeable across systems. Confirm the heater capacity, incoming water pressure, maximum operating temperature, and the tank manufacturer's sizing requirements. Check whether the system includes a check valve, backflow preventer, or pressure-reducing valve that creates a closed system.
For broader selections, compare thermal expansion tanks and plumbing expansion tanks. Related components include water heater valve kits with pressure relief valves and 3/4-inch water heater valve kits, although an expansion tank does not replace a required temperature-and-pressure relief valve.
Installation and Maintenance Considerations
- Precharge: Set the air charge to the specified cold-system pressure before installation.
- Support: Mount and support the tank according to its weight and the manufacturer's instructions.
- Inspection: Check for leaks, corrosion, loss of air charge, and unusual water-pressure changes.
Shop Expansion Tanks at PlumbingSell
Whether you're replacing a water heater expansion tank or selecting a compact unit for an appliance, compare capacity, connections, and published ratings before purchasing. PlumbingSell offers expansion tanks and related water-heater plumbing components for appropriately designed systems. Related plumbing work may also call for water heater valve kits with pressure relief valves, but the kit does not replace an expansion tank.
