Baxi Internal Water Leak

Visible water leak from the bottom of the Baxi water heater casing.

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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

Leaking plate heat exchanger gaskets, Corroded primary heat exchanger, Loose union on Baxi water block, Failed safety valve or drain cock

How to Fix / Troubleshooting

Safety: Turn off power and close the cold water isolation valve immediately. If the leak is hot, avoid contact to prevent burns.

Steps:

  • Identify source: Remove the front cover and carefully inspect for the highest visible point of moisture. Use a torch and tissue to trace the leak.
  • Tighten unions: Gently tighten accessible compression or union fittings on the water block and plate heat exchanger. Do not overtighten.
  • Check safety valve discharge: If water is coming from the safety valve discharge pipe, system pressure may be too high or the valve may be faulty.

Professional: Replacement of heat exchangers, safety valves, or internal pipework should be done by a qualified technician.

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Repair Difficulty

Hard 4/5

Required Part

Plate Heat Exchanger or Internal Pipework
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