By: Tom
A leaking boiler can spell disaster for your home's heating system. This comprehensive guide explores the common causes of boiler leaks.
Boiler leaks often stem from pressure-related problems. High pressure within the system can force water through the pressure relief valve, causing visible leakage. To check if this is the issue, locate the pressure gauge on your boiler. If the needle is in the red zone or above 2 bars, your system is likely over-pressurised. Reducing the pressure by bleeding your radiators can often resolve this issue.
Temperature fluctuations in your heating system can cause joints and pipe connections to expand and contract. Over time, this can lead to loosening and subsequent leaks. Inspect all visible pipe connections around your boiler for signs of wetness or dripping. Tightening these connections with an appropriate spanner may solve minor leaks, but be cautious not to over-tighten and damage the fittings.
Older boilers are particularly susceptible to corrosion, which can compromise the integrity of various components. The heat exchanger, a critical part of your boiler, is often affected by corrosion due to its constant exposure to water and heat. Corroded pipes can also develop pinhole leaks. If you notice rusty patches or discolouration around your boiler, corrosion may be the culprit.
Seals play a crucial role in maintaining a watertight system within your boiler. Over time, these seals can deteriorate, leading to leaks. Common areas where seal failure occurs include the pump seal, temperature control valve, and pressure relief valve. A faulty seal might manifest as a small, persistent drip or a more significant leak, depending on its location and the extent of the damage.
As boilers age, they become more prone to leaks due to general wear and tear. Components degrade over time, and repeated heating and cooling cycles can stress the system. If your boiler is over 10-15 years old and experiencing frequent issues, it may be more cost-effective to consider a replacement rather than continual repairs.
Recognising the signs of a boiler leak early can prevent more serious damage. Look out for:
When investigating a potential leak, start by examining the area immediately surrounding your boiler. Check all visible pipe connections, valves, and the boiler casing itself. Don't forget to inspect radiators and their valves, as leaks can occur anywhere in the heating system. Pay particular attention to joints and bends in pipework, as these are common points of failure.
Upon discovering a leak, safety should be your primary concern. Immediately switch off your boiler's electricity supply at the mains to prevent any risk of electric shock. Next, turn off the water supply to the boiler to minimise water damage. If you smell gas or suspect a gas leak, evacuate the premises immediately and contact the National Gas Emergency Service on 0800 111 999.
After ensuring safety, check your boiler's pressure gauge. Normal pressure should be between 1 and 1.5 bars when the system is cold. If the pressure is too high, it could be forcing water out through weak points in the system. If it's too low, it might indicate a significant leak has already occurred.
If your boiler pressure is too high, bleeding your radiators can help reduce it. This process involves releasing trapped air from the system, which can also improve heating efficiency. Use a radiator key to open the bleed valve slightly, allowing air to escape until water begins to flow. Be prepared with a cloth to catch any water and close the valve immediately once water appears.
For expert boiler repair services in Mansfield, Hucknall and Nottingham, get in touch with us by calling us on 0730 6012 396.
