Why Is My Boiler Leaking Water from the Bottom?

Leaks are never fun to discover. What starts as a little leak can quickly turn into extensive water damage. When you discover a leaking boiler, you might feel an even bigger sense of panic because you rely on your boiler system as your central heating system. Unfortunately, a leaky boiler is a common issue we hear from homeowners over the winter. If you find yourself in the same situation, it’s important to find and fix the source of the leak as soon as possible.

Heartland Heating, Air, and Plumbing explains what to do when you find your boiler leaking water at the bottom and offers some tips on how to troubleshoot and fix the problem.

My Boiler Is Leaking Water from the Bottom – Why?

There are many potential causes of boiler leaks, and unfortunately troubleshooting them can be difficult. In most cases, a boiler leak can be caused by problems with the seals or gaskets, pressure issues, or even corrosion. Below, we’ll explain common causes and what needs to be done to fix these issues.

Bad Seals

Between boiler components are seals or gaskets to help keep the unit watertight. These seals can break down over time due to temperature changes or corrosion, and this can allow water to escape from the boiler. In some cases, a leaking boiler may also be caused by loose fittings or pipes.

If you notice your boiler leaking, the first step is to check all of the seals and gaskets. If they appear to be in good condition, then you should check the fittings and pipes to make sure they are tight. In some cases, you may be able to fix a leaking boiler yourself. However, if the leak is severe or you are unable to identify the cause, then it is best to call a qualified technician for assistance.

Clogged Pressure Relief Valve

If you have a boiler, it’s important to keep an eye on the pressure relief valve. The purpose of this valve is to release pressure if the boiler gets too hot. If the valve becomes clogged with sediment, it can cause a boiler leak.

The good news is that this problem is easy to fix. Simply turn the boiler off and allow the unit to cool down. Then, open the valve lever for a few seconds to drain the sediment from the valve. This will help keep your boiler running smoothly and prevent your boiler from leaking water. If the water does not come out clean or the pressure relief valve still leaks, it’s time to call for boiler repairs.


Corrosion is a huge problem when it comes to boilers. Over time, the boiler’s metal components will start to break down and rust due to water exposure and temperature changes. This can cause serious damage to the boiler, and eventually lead to leaks. One of the most common places for corrosion to occur is at the bottom of the boiler, where water and heat can work together to break down the metal. In addition, corrosion can also cause problems with the boiler’s insulation, leading to heat loss and inefficiency.

As a result, it’s important to monitor your boiler and heating system closely for signs of corrosion, and have your boiler repaired or replaced as soon as possible whenever you notice corrosion.

Leaky Temperature Control Valve

A boiler temperature control valve is a device that helps to regulate the temperature of a boiler. By adjusting the flow of water through the boiler, the temperature control valve can help to keep the temperature at a consistent level.

However, if this valve is not properly maintained, it can be the cause of your boiler leaking water. To prevent this from happening, it is important to have the temperature control valve regularly checked and serviced. By doing so, you can help prevent boiler leaks and stay in good condition. If you do notice leaking water from the temperature control valve, contact a boiler repair company right away.

Schedule Boiler Repair Today

Not every HVAC company offers boiler repair services. When you need boiler repairs in Carbondale, IL you can trust the team at Heartland Heating, Air and Plumbing for help. Our boiler repair services can help get your system back up and heating your home comfortably again. Contact us today for more information or to schedule service.