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Leaking Overflow

Leaking Overflow

The Dangers of a Leaking Overflow Pipe

The Sign of Trouble

When you notice water leaking from your overflow pipe, it’s a clear indicator that there is a problem with your plumbing or heating system. Ignoring this issue can lead to significant damage and costly repairs.

Potential Causes

There are several potential causes for a leaking overflow pipe. It could be due to a faulty valve, high water pressure, or a blockage in the pipe. Identifying the root cause is essential in preventing further damage.
Ball or float valve stuck or letting by in the small or large tanks.
Partial blocked cold feed and vent causing the heating system to “pump over” into the expansion tank.
Pressure Relief Pipe dripping, which is caused by the system or boiler’s inability to cope with expansion, leading to the pressure relief valve discharging.  A faulty or flat vessel could be the root cause.
Condense pipe, now if it’s going into a gulley, this is perfectly normal, though dripping onto a floor, definitely not.  We have a blog about frozen condenses here

Water Damage

Leaving a leaking overflow pipe unchecked can result in water damage to your property. This can include damage to the walls, ceilings, and even the foundation of your home (as condense water is mildly acidic). The cost of repairing this damage can be steep or has the potential to be costly.

Mold and Mildew

Another consequence of a leaking overflow pipe is the growth of mold and mildew. This not only presents a health hazard but can also be difficult and expensive to remove. It also doesn’t look very pleasant.

Wasted Water

A leaking overflow pipe can lead to a significant waste of water, causing your water bill to skyrocket. In addition to the financial impact, wasting water is also harmful to the environment.  With the cost of living crisis at the level it’s at, any penny saved is essential.  Find more money saving tips here

Preventive Measures

Regularly inspecting and maintaining your plumbing system is crucial in preventing a leaking overflow pipe. It’s important to address any leaks or issues promptly to avoid further damage.  We recommend these checks be done annually.  Start by booking your boiler and cylinder if you have one, in for its annual service.


In conclusion, a leaking overflow pipe is not a problem to be taken lightly. The potential consequences, including water damage, mold growth, and wasted water, make it imperative to address this issue as soon as it arises. Regular maintenance and prompt repairs are essential in protecting your property and your wallet.
For anything boiler, plumbing or heating related, give us a call on 01732 622990 or Contact Us
Tom Hewitt
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