Buderus Internal Water Leak

Water heater is leaking from the bottom of the unit.

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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 heat exchanger, Loose or corroded pipe connections, Failed pressure relief valve, Cracked condensate trap or drain connection

How to Fix / Troubleshooting

Safety: Turn off power, close the cold water supply, and shut off gas. Water may be hot and surfaces slippery.

  • Identify leak source: Remove the front cover and use a flashlight to trace the leak upward. Check all visible joints, valves, and the heat exchanger.
  • Check relief valve: Inspect the temperature and pressure relief valve discharge pipe. If water is discharging, test system pressure and replace the valve if it is weeping at normal pressure.
  • Tighten fittings: Carefully tighten any accessible threaded or compression fittings that are seeping.
  • Condensate vs. water: Determine if the leak is condensate (clear, from plastic piping) or system water (may be discolored). Repair condensate trap or piping if cracked.
  • Heat exchanger leak: If water is clearly coming from the heat exchanger body, replacement of the exchanger or entire unit is typically required and should be done by a professional.
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Repair Difficulty

Hard 4/5

Required Part

Heat Exchanger / Pressure Relief Valve / Condensate Trap
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