Plumbing
Check the water-heater expansion tank
A properly sized and charged potable-water expansion tank absorbs pressure increases as heated water expands in a closed plumbing system.
Recommended timingInspect yearly; test by manufacturer instructions
What to do
- Record the tank model, installation date and required pre-charge shown by the manufacturer or plumbing professional.
- Look for leakage, corrosion, a damaged air valve, loose support or a tank hanging from piping without appropriate support.
- Ask a qualified plumber to verify system pressure and tank pre-charge on the schedule required by the manufacturer; accurate testing requires isolating water pressure.
- Have a waterlogged, leaking, corroded or incorrectly supported tank replaced rather than attempting to recharge a damaged vessel.
- Include the pressure regulator, backflow device and relief-valve behavior in the evaluation because they affect expansion pressure.
This is a pressurized vessel. Do not drill, heat, puncture or remove it while the plumbing system is pressurized.
Official guidance and sources
Product instructions and local requirements take priority for the equipment or material installed at your home.