Skip to content
We've helped thousands of households get free energy upgrades in the last 7 years
Warma UK logo
Boiler Leaking Water

Boiler Leaking Water – What Should I Do?

Experiencing a leaking boiler may be a common problem, although, it certainly is not an ideal scenario to find yourself in. The leak has probably taken you by surprise, making you feel way out of your comfort zone. However, this guide will enlighten you with the necessary steps to help you solve this inconvenience.

What should I do if my boiler is leaking?

In the case of your boiler leaking water, you should find all the leaks and use a bucket to stop the water from damaging your home. You can always try and tighten the fitting to see if that stops the leak. If not, then ensure that you turn off the water supply and the heating. Throughout the process of discovering a boiler leak, it is always advisory to call in a gas safe registered engineer to oversee the situation.

Can I fix a leaking boiler myself?

Even though you might have deemed yourself to have done a satisfactory job in stopping the initial water flow, when dealing with a boiler fault, it is always a good idea to contact a qualified engineer. Although, if getting access to an engineer instantly is out of the question, then there are some actions you can take to minimise the damage in the short run. There is the possibility that you can use a boiler leak sealant, an additive that forms a seal to block the leak. Of course, these temporary measures should only be taken on small leaks. Even if you are successful in stopping the leak, it is still important to seek the advice of an engineer, to find the cause of the problem.


Why is my boiler leaking water?

To discover why your boiler is leaking water, you will need a qualified engineer to assess the situation. There are several explanations for why your boiler might be leaking water. Once the engineer has found the root cause of the problem, the boiler can be fixed, helping you to avoid long-lasting damage.


Your boiler’s leak could be a pressure-related issue. Generally, the boiler’s pressure gauge should be around one bar and within the green markings. Anything above the green bar will indicate that the boiler is over pressurised, prompting the cause of the leak. Bleeding your radiators is often the way to reduce the pressure of your boiler.


The corrosion of pipes and hot water cylinders could well be the reason for your leak. The extent of this corrosion will be indicated by the severity of your boiler’s leak. If just a small part is corroded, then an engineer might be able to resolve the problem, by replacing the component. However, if the corrosion is beyond fixing, then you may have to purchase a new boiler altogether.

Faulty Installation

If you are experiencing a leak in a newly installed boiler, then it is most likely because the joints in the pipework have not been fitted correctly. To resolve this issue, you simply contact your boiler installer to refit the pipework, which will in turn stop the leak.

Broken Seals

Seals are placed on parts and joints within your boiler, although, if your boiler corrodes, it can result in the seals being damaged. When this happens, the water that travels through the system leaks through the seal. While applying sealant is a good short-term fix, you will also need an engineer to assess the damage.

Faulty Heat Exchanger

Another reason for a leaking boiler is a faulty heat exchanger. This fault tends to occur with boilers that are old or of low quality. As a heat exchanger is the most expensive component, this is usually a sign that it is time to invest in a new boiler.

How dangerous is my leaking boiler?

A boiler leaking water is not considered dangerous in a physical sense, as it will not threaten your health and wellbeing. However, a leaking boiler can certainly damage your bank account. Therefore, it is important to avoid using your leaking boiler, as this could result in water spreading around your property, damaging furniture, floors and other belongings. In any case of a leaking boiler, it is always best to consult an engineer first. Although, a leaking boiler generally means it is time for a replacement unless your boiler has recently been installed incorrectly.

Worcester Bosch Boiler

Homeowners are still able to get a FREE boiler grant or insulation grant via the ECO scheme, which is still available to households that qualify. Warma UK are currently working throughout the UK helping privately owned and rented homes to improve home energy efficiency and save money on rising energy bills.

For more information email –

Or call 03304600065

Apply For Your Government Backed Heating Grant

Following your successful application, we will arrange a free, no obligation survey to ensure the maximum grant is obtained and advise you on the best products to reduce your homes energy usage.

Michael Cornish