Why Is My Boiler Leaking Water From Underneath - T-Tees - Your Answers Await, Life's Questions Unraveled

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High boiler pressure

Have you ever noticed the pressure gauge on the front of your boiler? This is important as it tells you how much pressure there is in the system. Too little or too much pressure can cause a problem and so you should check the valve every now and then and add or remove water as required.

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If your boiler is leaking, you should check the pressure gauge to see if the pressure is too high. If this is the case, it’s likely that the pressure relief valve (PRV) is trying to release some of the water in the system to bring the pressure back down to a comfortable level. The valve needle should be between one and 1.5 bar (usually shown on the gauge as a green zone). If the needle is higher than this, or in the red zone, you may need to bleed the radiators to release extra water.

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Corrosion in your system

Corrosion can be a problem in older boiler systems as it can cause rust and other debris to build up within your radiators and pipework. As the water runs around the system, it can pick up this debris and return it to your boiler as well. The older the system, the more likely you are to have issues with corrosion. The only problem is, many people don’t know it’s there as it can’t be seen.

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Corrosion can also break the rubber seals around the joint of two pipes, so water may be leaking through here. If the corrosion is on an individual component, a Gas Safe engineer will be able to replace this with ease. However, if the corrosion is widespread, then you may need to replace the boiler and central heating system completely. An engineer will be able to advise if a new system is required or if a new boiler and flushing the system would be adequate. If you have an old boiler, replacing it with a newer model could make your home more efficient and you could save money on your gas bills too.

Faulty heat exchanger

The heat exchanger is the part that allows your boiler to heat cold water, so it’s a very important part of the appliance. Unfortunately, a leak can be a sign that the heat exchanger is starting to decay. It’s not uncommon for this part to crack in some models over time, and it can be expensive to replace. This isn’t a problem that you’ll be able to diagnose yourself, as it involves taking off the cover of the boiler and looking inside. Therefore, you should call a Gas Safe engineer to check the issue for you. Some are more susceptible to corrosion due to the materials they are made from. Viessmann heat exchangers offer a 10 year warranty.

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