Oso
Element Gasket / Flange Seal Leak
Oso water heater leaking from around the immersion heater flange or element boss.
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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
Perished or compressed element gasket, Improperly torqued element flange, Corrosion on cylinder boss, Incorrect replacement gasket used
How to Fix / Troubleshooting
Safety first: Turn OFF power and isolate the cold water supply. Allow the cylinder to cool before draining.
- Relieve pressure: Open a hot tap to relieve pressure in the cylinder.
- Drain below leak level: Use the drain valve to lower the water level below the element flange.
- Remove element: Disconnect wiring, undo the flange or threaded boss, and remove the element.
- Clean sealing surfaces: Carefully clean the cylinder boss and element flange of old gasket material and corrosion.
- Fit new gasket: Install a new Oso‑compatible gasket and refit the element, tightening evenly to the specified torque.
- Refill and check: Refill the cylinder, bleed air, and check for leaks before restoring power.
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Repair Difficulty
Hard
4/5
Required Part
Oso immersion heater gasket / flange seal
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