Why is my boiler leaking? August 18, 2025 A leaking boiler is a problem that no homeowner wants to face. Even a small drip can be a sign of an underlying issue that could lead to bigger problems if left untreated. From damaged components to pressure issues, there are several reasons why your boiler might be leaking. Understanding the possible causes and knowing when to call a professional can help you protect your heating system and avoid a costly breakdown. Common reasons for a leaking boiler High boiler pressure If the pressure inside your boiler is too high, it can force water out through the pressure relief valve. This is often visible as dripping or pooling water beneath the unit. Regularly checking the pressure gauge and keeping it within the recommended range can prevent this issue. Worn seals and joints Over time, seals and joints inside the boiler can degrade, allowing water to escape. This is particularly common in older systems or those that haven’t been serviced regularly. Replacing these seals is a straightforward job for an experienced engineer, but it is best done quickly to prevent further leaks. Corrosion inside the boiler Corrosion is one of the main causes of leaks in boilers. Rust can weaken pipework, valves, or even the heat exchanger, leading to small cracks where water escapes. Corrosion is often linked to poor water quality or a lack of system maintenance, making regular servicing essential. Faulty components Leaking water can also point to a faulty part, such as the pump, expansion vessel, or internal pipework. Identifying and replacing these components early prevents more significant damage to the system. Installation issues In some cases, leaks can be traced back to poor installation. Incorrectly fitted pipework or inadequate sealing can cause ongoing problems. This highlights the importance of choosing skilled boiler installers in Bolton, Wigan, or Warrington for any new installation. External factors Not all leaks come from inside the boiler. Frozen condensate pipes in cold weather or external connections that have loosened can also be the source of the problem. These issues can usually be resolved quickly once identified. Why you shouldn’t ignore a leak Even minor leaks can lower efficiency, increase running costs, and put strain on the boiler. If left untreated, a leak could cause electrical faults or damage to your property. Calling a professional heating engineer for boiler repairs in Bolton, Wigan, or Warrington as soon as you spot water is always the safest option. How to prevent boiler leaks While not all leaks are avoidable, good maintenance goes a long way in reducing the risk: Book an annual boiler service in Bolton, Wigan, or Warrington to catch early signs of wear. Monitor boiler pressure regularly and adjust if it is too high or low. Insulate external condensate pipes to prevent freezing in winter. Call a heating engineer promptly if you spot unusual noises, pressure changes, or early signs of water around the boiler. Local experts for boiler repairs in Bolton, Wigan, and Warrington If your boiler is leaking or showing signs of a fault, TwinSun Heating Ltd is here to help. Our experienced engineers provide expert boiler repairs, servicing, and new boiler installations across Bolton, Wigan, and Warrington. Whether it’s a small drip or a more serious breakdown, we’ll diagnose the issue quickly and restore your heating system safely. Contact our team today to book your boiler repair or arrange a boiler service.
