Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

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What Causes Leaking in Home Radiators and How Can You Recognize the Problem?

Radiators are essential elements of your building’s heating system. Your building’s boiler heats water or steam and sends it through pipes to the radiators, which radiate heat into a room. The heat from radiators is more humid and comfortable because it does not remove moisture from the air like forced air systems do.

Despite their efficiency, though, radiators are slower to react to thermostatic changes and are more prone to damage than other systems. A common issue with older radiators is leaking. Discover the primary causes of a leaking radiator and signs for when it’s time to replace it.

Top 3 Causes of a Leaking Radiator

1. Faulty Radiator Valve

A radiator valve controls the heat generated by the radiator by managing the amount of hot water or steam that enters or exits the appliance. There are several types of radiator valves, including manual, thermostatic, and smart. Most modern radiators use thermostatic valves that self-regulate.

The valve has several components to ensure proper function and watertightness. When any of the parts fail, the radiator may leak.

A faulty radiator valve is the most common cause of leaks. This fault likely stems from a connection point, such as the radiator tail or connection to the heating system, or the securing ring. Unfortunately, if the valve is faulty, the best solution is to replace it.

A radiator valve can start to fail due to regular wear and tear or manufacturer error. Most often, though, the issue stems from poor maintenance or neglect.

Sanitary Plumbing can make quick work of a leaking radiator. Our licensed plumbers assess the system and diagnose the leak source before recommending a solution.

2. Damaged or Loose Radiator Spindle

A radiator spindle connects the radiator to the pipework. It is usually a joint connecting the radiator unit to the radiator valve. The spindle connects with a gland nut, and if the nut is loose, leaks can occur.

To fix this leak, tighten the nut to tighten the spindle. If securing the nut is not enough, you can try wrapping the spindle with PTFE tape.

While these proposed fixes are simple enough, keep in mind that the leak may stem from other issues. It is always best to reach out to Sanitary Plumbing and schedule an inspection of the leaking radiator to determine the definitive cause and offer a more permanent solution.

Depending on the cause of the leak, problems may worsen over time. To avoid moisture damage and ensure tenants and units have adequate heat, it is best to adhere to maintenance and inspection schedules and hire professionals for repairs when problems arise.

Sanitary Plumbing offers annual service contracts. By signing up, you ensure your building and its plumbing systems, including the radiators, receive regular maintenance checks and inspections, reducing the risks of unnoticed and unmitigated leaks.

3. Rust or Corrosion

Steel and aluminum are the primary alloys in radiator construction because they are excellent conductors of heat. However, these metals are vulnerable to water and steam damage. To prevent this, the water in radiator system is treated with chemical inhibitors.

Appropriately high inhibitor levels protect the appliance from corrosion. However, when inhibitor levels are low, internal corrosion can cause small holes to appear at the bottom of the radiator and lead to a leaking radiator.

You typically only see corrosion of this level in older radiators. The holes start small, only permitting a tiny amount of water to drip out. Brown staining on the radiator or the carpet around it is what most people notice before any pooling.

If a radiator develops holes, it is best to replace the unit. Sanitary Plumbing can exchange old radiators for new ones and ensure the system is suitable for modern living.

3 Signs It’s Time To Assess or Replace a Radiator

1. Leaks

While it is possible to patch and repair most leaks, water appearing under and around a radiator is never a good sign for the appliance. A radiator should keep water and steam within the unit; the system should be watertight.

If you have a leaking radiator, contact Sanitary Plumbing to assess the appliance and determine its salvageability. Unless the leak stems from a faulty connection, not the unit itself, it is best to replace, not repair.

2. Running Cold

Sometimes a radiator stops functioning; the unit remains cold despite the heat being on. Many problems, including a broken thermostat, can cause a radiator to run cold.

On average, thermostatic radiator valves can last between 10 and 15 years. It is best to err on the side of caution and assess valves at regular intervals. Radiator and heating system inspections include checking the components for age and performance.

Finally, a cold radiator can stem from air in the system. When too much air builds up in the system, it affects steam or water circulation. The radiator often needs to be bled to resolve the problem.

3. Overheating

Overheating can cause a leaking radiator and worse. Typically, a radiator overheats because of a blocked flow or buildup of material. The blockage creates pressure in the unit, and if the pressure builds enough, the unit can crack, requiring a radiator replacement.

You can minimize the likelihood of having to replace a radiator by contacting Sanitary Plumbing at the first sign of trouble. If you notice a radiator is unusually hot, shut down the system and call for immediate service.

Avoid a Leaking Radiator With an Annual Service Contract

Call Sanitary Plumbing To Learn More

Radiators are critical to the even distribution of heat throughout your property. Unfortunately, they are also susceptible to problems like leaks. You can avoid a leaking radiator and other issues by signing an annual service contract with Sanitary Plumbing, ensuring routine maintenance and necessary inspections occur without fail. Call Sanitary Plumbing at 212-734-5000 to learn more.

Our Privacy Policy

Omnia Mechanical Group(the “Company”) strives to ensure the highest standards for property listings and customer information privacy. Please review the following statement to learn about our company practices and policies. Please be aware that our Privacy Policy is subject to change at any time.

1. Purpose.

This Privacy Policy (“the Policy”) provides information on how the Company uses your personal information. By agreeing to the Policy, you agree to our collection and use of your personal information as described in the Policy. This Privacy Policy is effective for all new users of

2. Personal Information.

You can browse some areas of (“the Website”) without being a registered user. However, certain activities do require registration. (You consent to the transfer and storage of your information by registering with

3. Use of Information.

Our primary purpose in collecting personal information is to provide you with a safe and user-friendly experience. For example, the Company may use your personal information to:

  • Improve our services and the Website’s content and layout;
  • Provide the services and necessary customer support you request;
  • Resolve disputes, collect fees, and troubleshoot problems;
  • Track and record customer satisfaction with our services;
  • Protect the Company against error and fraud;
  • Inform you of special promotions and announcements;
  • Enforce our agreements, terms, conditions, and policies; and
  • As otherwise described to you at the time of collection.

We may occasionally ask you to complete optional surveys. These surveys are used to improve and customize your experience with

The Company always provides you the ability to opt-out of further communication such as promotions and surveys; see the Opt-Out section below.

The Company does not share any of your personal information with outside organizations, companies, individuals, etc. The only exception to this standard is if such a disclosure is reasonably necessary to respond to any and all legal processes.

4. Links to Other Sites.

The Website may have links to other websites that may collect personally identifiable information about you. The Company is not responsible for the privacy practices of the content of those linked websites.

5. Safety & Security Precautions.

The Website has strict security measures in place to protect you and your information from fraud. Once your information is provided to Omnia Mechanical Group, we strive to ensure the confidentiality of your identity and information.

6. Opt-Out.

The Company provides you with the opportunity to opt-out of receiving promotional and other non-essential, marketing-related communications from Omnia Mechanical Group. If you would like to opt-out of these select communications, please see any of the Company’s email communications and follow the directions indicated.

7. Account Protection.

Your password ensures the security of your account. When choosing a password, the Company suggests using various characters. It is highly recommended that you do not disclose your password to anyone. (If you do disclose your password or your personal information with others, you are responsible for all actions taken in the name of your account.) If the security of your password is compromised for any reason, please contact the Company immediately.

8. Accuracy of Information

The Company does not guarantee the accuracy of information for any and all of its properties on the Website, and is not responsible for any errors or misrepresentations (made by Renters, the Client, or otherwise).

9. Cookies

The Company may place a small cookie on your computer’s hard drive. This allows us to personalize your use on the Website. In order to maximize the functionality and usability of the Website, you must set your browser’s preferences to allow both permanent and temporary cookies.

10. Changing Your Personal Information.

Should your personal information change, please immediately update your information on the Website. This will ensure the accuracy of our records. The Company does retain personal information from closed accounts in order to comply with law and collect and disburse any fees owed.

11. Third Parties

This Privacy Policy addresses only the use of information we collect from you. Since does not control the privacy policies of third parties, you are subject to the privacy policies of those third parties. It is advisable that you consult with the management of third parties before you disclose your personal information to others.

12. General

We may amend this Privacy Policy at any time by posting the amended terms on the Website. All amended terms are immediately effective after they are initially posted on the Website.

13. Privacy Policy Questions & Concerns

Questions and/or concerns regarding the Policy should be emailed to the following email address: