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What Should I Do if My Boiler Is Leaking Water?

A boiler is a fairly straightforward appliance that is hardworking, reliable, and long-lasting, with fewer moving parts than a more traditional heating system. When professionally installed and maintained, your boiler should last an average of 15 to 20 years! However, one of the most common concerns about boilers that can arise at any time is water leakage, and diagnosing the cause of the issue typically requires the skill and experience of a professional.

The team of experienced and skilled technicians at National Heating and Air Conditioning can help with boiler repair, maintenance, and installation services for homeowners in and around the Cincinnati, Ohio, area.

Image of a boiler in a backroom in the color white

If your boiler is leaking water, call the experts at National at (513) 621-4620, or contact us online and let us know how we can help.

Reasons Why Your Boiler May Be Leaking Water

Any type of appliance that circulates water is prone to leakage, but the key to minimizing damage to your home and property is to identify and address the leak as soon as possible. Common reasons for leakage include:


Any time that water and metal meet, corrosion can occur. If it should develop on the interior or exterior surface of the tank, or on pipes or valves, the metal will deteriorate and water can escape. Depending on the location and severity of the corrosion, parts may need to be repaired or replaced.

Pressure Issues

Your boiler should maintain an even pressure, but an accumulation of calcite or limestone can cause the pressure to increase to dangerous levels. When safe levels are exceeded, water leakage may occur from the valve to relieve the pressure and prevent the tank from rupturing.

Damaged Seals

Leakage from the seals around the boiler pump is a sign that either the seals, the pump, or both need to be replaced.

Poor Installation

Inadequate installation practices lead to leakage from a number of areas, although the most likely cause is insufficient soldering around copper fittings.


Cracks, corrosion, damage, or stress fractures can occur with age, causing water to leak from the boiler.

What To Do if You Discover Your Boiler Is Leaking Water

Follow our step-by-step guide if you suspect your boiler may be leaking:

Step One: Find the source of the leak

Determine if the leak is coming from any of these sources:

  • Discharge tube from the pressure relief valve
  • The drain valve at the bottom of the tank
  • The tank itself

Step Two: Take preventive measures

Prevent further damage and leakage by disabling the supply of water and power to the boiler.

Step Three: Call National for boiler repair

Maintain your warranty, ensure the safety of your home and family, and schedule reliable, efficient boiler repair by calling the experts at National at the first signs of a water leak.

Boiler Repair in Cincinnati, OH & Surrounding Areas

Since 1930, the team of professionals at National Heating and Air Conditioning has provided top quality, reliable boiler repair, maintenance, and installation services to Cincinnati-area homeowners. Customer service is our number one priority and has helped us earn our stellar reputation as the area’s trusted source for heating and cooling services, insulation, home automation, and more.


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