Why is my Boiler Leaking Water? | 5 Reasons Why and How to Fix It

Just like any other appliance around your house, a boiler leaking water can understandably cause a bit of a worry.

There are a few reasons why this may happen, but it’s important to act on it straight away to avoid your boiler getting seriously damaged. Whether it’s corrosion, pressure or a poor installation on your current boiler, the problem will need rectifying.

Choosing an reliable installer is also very important. Any cheap quote for installing a boiler can be tempting, but you’ll be paying for it further down the line in the form of repair work if you’ve had a low-quality installation. By choosing an installer with strong relations with their manufacturer, you’ll be getting a service from professionals who know the product better than anyone. For information on how this can done, scroll down to the bottom of the page!

In this article you’ll find valuable information on common causes for your boiler leaking water, how leaking water can be stopped as well as the best ways to prevent the problem from returning.

For further information, you can also take a look at some of our previous blog posts:

For a free, no-obligation quote, you can either contact us directly on 029 2009 9898, or enter your postcode in the box below and hit the green button!

Common causes for a boiler leaking water

The first thing you should do if you come across a leaking boiler is to find the source. Once done, you’ll be able to identify which of the following occurences is the reason for your boiler leaking water:

1. Corrosion

Corrosion affects your boiler

We’ll start with one of the more common examples.

Corrosion will mostly affect your pipework, but if it’s affecting a single component like your heat exchanger, in theory that would be all that needs replacing. If the corrosion spreads elsewhere however, you may have to consider replacing your boiler as well.

How do I check for corrosion in my heating system?

Checking for corrosion is normally quite an easy task, as it’s typically just a case of looking around the pipework and other parts of your heating system. However, if it’s coming from inside the boiler, avoid doing anything else until a professional can make their own assessment and an informed decision.

If you’re already past this point and want to move forward with replacing your boiler, speaking to a heating expert is the best thing for you to do.

Get in touch with one of our in-house advisors on 029 2009 9898 or get a free, no-obligation quote by entering your postcode in the box below, then hit the green button.

2. Boiler Pressure Too High

Another reason for a central heating system leaking could be that the pressure relief valve is consistently discharging water from your system. The most likely cause of this is your boiler’s pressure is too high.

To check if this is the case, look at your boiler’s pressure gauge. In most cases, this is found at the very front of the boiler with a small gauge needle indicating the current pressure level.

A comfortable level for any boiler to operate at would be around 1.4 bar, indicated by the red ring you can see in the example photo below.

The pressure gauge can help you identify why you have a boiler leaking water

How do I fix my boiler’s pressure issue?

There are a few things you can do to help solve the issue of your boiler leaking water. One of which is to bleed your radiators to relieve some of the pressure. However before you carry this process out, make sure your boiler’s filling loop has been firmly closed. This can be confirmed by checking that the black taps are perpendicular to the pipe. If they’re facing the same direction, the filling loop will be open.

For a detailed guide on how to bleed your radiator for lowering the pressure, take a look at the following video:

This is one of the more common ways of solving the problem, and is worth trying before anything else. If it’s not enough to keep the boiler pressure down however, then it might be because of restricted water flow due to a build up of limescale or other deposits inside your pipework. If this is the case, then you’ll need to have a Gas Safe Registered engineer make an assessment on how you can proceed.

For more information on related topics, take a look at some of our other blog posts:

3. Leaking Heating Pump

This one isn’t quite as common as the others, but can still be hard to detect if you’re not familiar with how boilers operate.

Heating pump

An example heat pump found in modern boilers.

If your boiler and central heating system is quite old, the seal around your heating pump can take some damage over time due to elements moving around your system. It could also be because your boiler’s pressure is too high, putting even more strain on the seals around the heating pump. If this isn’t fixed, water can continue to leak out.

How to fix a leaking heating pump

This is definitely something that needs to be left to a professional to fix. If you’re not a qualified Gas Safe engineer, tampering with your boiler is a big no-no. Not only because there’s a chance there could be more damage to the boiler and its components, but you’ll also risk invalidating your warranty, causing you even more of a hassle.

By speaking to a heating expert directly, you can find out whether the boiler pump needs resealing, replacing or if you need to replace your whole boiler.Speak to an expert for professional advice to find out why you have a boiler leaking water

4. Loose Pipework Joints

This one is often one of the more easier causes to identify, mainly because it doesn’t take much effort to spot.

Leaks can come from loose pipework joints

As with almost every appliance around the house, your boiler may take ‘wear and tear’ damage over time. This is often down to the hot and cold water traveling through your pipework, causing it to frequently expand and contract. It could also be down to corrosion or a poor installation, but the joints in your pipework will show some of the earlier signs of your boiler leaking water, so keep an eye out.

How to fix loose pipework joints

loose pipework joints can cause your boiler to leak water

Once again, this is an easy one to answer. You must avoid fixing anything like this yourself, as you’ll need a qualified engineer to fix the problem. If you’re unsure on how to arrange this, you can speak to one of our in-house experts directly for some reliable, reassuring advice to help you get to the next stage.

5. Poor Installation

You’ll notice that many causes of boiler leaking water found in this blog post focus on faulty components, dodgy pipework as well as other issues. In almost every occasion, this will be down to the quality of your original installation.

A reliable installer like Boilerhut makes all the difference for having a high-quality boiler

If you’re ever in the process of choosing your next boiler, it’s extremely important to recognise that for a low-cost, or ‘cheap’ option, you’re only going to get the same value back with your installation. However, if you’re willing to put in more for a premium boiler and installation, you’ll be able to enjoy a comfortably heated home for years to come.

How to choose the right installer for your new boiler

Choosing the right installer is extremely important. Ideally, you need to select one who not only knows the product well and provide you with industry-best support, but also has a strong working relationship with their manufacturer. For more information on how this can be done, scroll down to the bottom of the page.

Is it dangerous to have a boiler leaking water?

Naturally, there are more than a few common boiler problems that come with having a leaking boiler.

Most notably is if this is left unattended, you’ll only be causing more damage to your property, the boiler and its internal components. This includes a build up of corrosion and mould, which brings in more health concerns if not dealt with straight away. Once again if you’re unfamiliar with this, the best thing is to seek professional help at this point rather than make any repairs yourself.

Avoid a build up of corrosion and keep an eye on your central heating system

Should I use my leaking boiler?

This may seem obvious to some, but it’s actually really important not to use your boiler at any point during this period. If you come across a leak anywhere in your heating system, make sure your boiler is switched off. As well as this, make sure your water supply is cut off. Once done, you can speak to a professional for more advice on what to do next.

How do I fix my leaking boiler?

At this point, it should be quite clear just how important it is to select the right installer for your new boiler. A boiler leaking water can understandably cause a bit of upset. However, choosing an installer who knows their product well can make a world of difference. Not just for the initial install, but the aftercare work as well.

At Boilerhut, we work closely with top brands like Viessmann to make sure you get a high-quality product and installation. Because we’re a Premium Viessmann Installer, we’re also able to provide various benefits you wouldn’t find anywhere else such as exclusive extended warranties and improved aftercare support.

If you’d like to speak to one of our in-house heating experts for reliable advice, you can call us directly on 029 2009 9898. Alternatively, you can get a free, no-obligation quote online by filling your postcode in the box below, then entering the green button. From here, you’ll be able to an idea in minutes on how much more you can save with a brand new boiler! Easy-peazy!

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