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The most common reasons a boiler leaks water include:
- Excessive system pressure
- Loose pipe fittings
- Worn seals or gaskets
- Corroded heat exchanger
- Faulty valves or air vents
- Mineral buildup inside pressure controls
Common Causes of Boiler Water Leaks
1. High Boiler Pressure
Boilers operate within a designed pressure range. When pressure becomes too high, weak points in the system may begin to leak. A malfunctioning pressure relief valve is often the main cause.
2. Loose Pipe Connections
Normal operation creates vibration that can gradually loosen pipe fittings. Even small gaps in connections can lead to water seepage over time.
3. Worn Seals or Damaged Components
Seals and gaskets degrade after long exposure to heat and pressure. Aging materials or improper installation can allow water to escape from joints or internal sections.
4. Damaged Blowdown Valve
The blowdown valve removes sediment buildup inside the boiler. If the valve is cracked or not tightly sealed, water leakage may occur.
5. Corroded Heat Exchanger
Continuous contact with hot water causes metal corrosion. A weakened heat exchanger can eventually develop cracks, making leaks unavoidable.
6. Faulty Automatic Air Vent
Automatic air vents release trapped air to maintain heating efficiency. When damaged or blocked, they may start leaking water instead of air.
7. Blocked Pressure Valve
Mineral deposits and debris can prevent the pressure valve from closing fully, resulting in constant dripping or leakage.
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