GSW
Tank Corrosion / Inner Tank Rupture
GSW water heater leaks from the side or bottom of the tank body (not from fittings)
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed glass lining, Depleted anode rod, Long-term corrosion, Excessive water pressure
How to Fix / Troubleshooting
Safety: Turn off power or gas immediately. Close the cold water supply and open a hot tap to relieve pressure.
- Confirm source: Remove access panels and insulation to verify water is seeping from the tank shell, not fittings or valves.
- Do not attempt tank repair: Welds or sealants are not safe or reliable on a pressurized water heater tank.
- Plan replacement: Arrange for replacement of the GSW water heater. Verify correct size, fuel type, and venting for the new unit.
- Check expansion control: Have a plumber evaluate system pressure and install or service a thermal expansion tank and pressure-reducing valve if needed to protect the new heater.
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Repair Difficulty
Professional Required
5/5
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