A hot water heater may leak for several reasons, ranging from minor component issues to serious tank failure. According to expert insights, common causes include:

  • Tank Corrosion and Age: Over time, the internal tank can corrode, especially if the unit is more than 10 to 15 years old. This typically leads to a leak from the bottom of the tank, which often requires a full replacement.
  • Loose Fittings and Valves: Leaks can occur at the cold water inlet or hot water outlet fittings if connections become loose. Additionally, a faulty drain valve or temperature-pressure relief (TPR) valve may drip if they are damaged or failing to seal properly.
  • Sediment Buildup: In areas with hard water, mineral deposits settle at the bottom of the tank. This buildup causes overheating and rumbling noises, which can eventually damage the tank and lead to leaks.
  • High Water Pressure: Persistent overpressure within the system can force water out of the valves. In these cases, installing an expansion tank or pressure regulator may be necessary.

If you discover a leak, it is important to immediately shut off the power or gas supply and the cold water inlet valve to prevent water damage or safety hazards.


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