Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

Contact us on email!

Why Is Your Boiler’s Low Water Cut Off So Important?

Boilers are the lifeblood of New York City’s larger buildings, as they are essential for heat and hot water. One of the most critical elements in any boiler system is the low water cut off. Here’s what you need to know about this vital component of your boiler and how to keep it in good shape to prevent malfunctions that could be a safety hazard for the property.

What Is the Function of the Low Water Cut Off?

Essential boiler safety

Normally, your boiler fills with a steady supply of water to make hot water and steam for radiators. However, if there is a problem with the replenishment of water, the boiler can overheat, much like an empty pan left on a hot stove. This is known as “dry firing.”

The consequences of a dry fired boiler are dire as the boiler can become permanently damaged.

To prevent this type of disaster, boilers for the last 100 years have been outfitted with low water cut off mechanisms, which are now required by the New York City Code. If the level of water in the boiler tank is less than the minimum required for safe operation, the boiler shuts off when this device cuts the electrical circuit and/or gas fuel line.

Often, the low water cut off is integrated with the boiler feed controls, as they are all part of the same operational loop. When the low water sensor (see below) detects the boiler’s water level is dropping, it cues the device to add more water. If the water level is not restored, the cut off process commences.

Two Types of Low Water Cut Off Systems

Float type

Many applications use the float type of low water cut off device. This simple mechanism, which resembles the float used in a toilet tank, is connected to an electrical switch, which is in turn linked to the boiler’s burner. When the tank’s water level becomes too low for safety, the circuit is broken, which triggers the burner to shut off.

Electronic sensor

Some boiler systems employ an electronic sensor that immerses an electrode tip in the boiler tank. If the electrode becomes dry due to a low water level, the circuit powering the boiler is cut, so it stops heating.

Why Do Low Water Cut Offs Sometimes Malfunction?

Usually maintenance related

Low water cut offs can fail, and, unfortunately, this is often due to entirely preventable conditions. Proper checks and maintenance can prevent malfunction due to these common causes:

  • Buildup of sediment, rust, or mineral scale on the low water sensor that prevents it from moving freely
  • Low water cut off system past its useful lifespan and prone to leaks (float taking on water), worn parts, or electrical shorts
  • Improper setup of the low water cut off device
  • Incorrect boiler blowdown process that creates a vacuum and causes disintegration of the float sensor
  • Bent control arm

Maintenance Tips for Boiler Low Water Cut Off Mechanisms

Expert advice

As mentioned above, regular maintenance of your boiler system, including the low water cut off, can prevent catastrophe brought on by dry firing. Here are some tips from the experts at Calray Boilers to keep your system operating properly.

Never wait for your low water cut off device to fail before repairing or replacing it if you notice something is wrong. If you’ve had previous problems with the low water cut off malfunctioning, at minimum, it should be monitored regularly as part of your routine checklist.

Recognize signs of trouble that should prompt a call for professional boiler service:

  • Undesirable elements in the water due to lack of boiler water treatment, hard water, corrosion, or sediment that needs to be filtered
  • Boiler components triggering circuit breaker
  • Signs of electrical wear and tear, like broken switches or frayed cords
  • Poor visibility in sights
  • Gauge readings not within normal range
  • Problems with the automatic boiler feed system or steam return lines

If you have questions about how to perform these checks, we’re happy to help you. We can also address issues related to improper boiler blowdown.

Finally, be sure to schedule a full boiler maintenance check at least once per year – more often if your boiler is old or if you want the peace of mind that comes with knowing it’s in top shape. Call Calray Boilers at 212-722-5506 or use our easy online form to schedule a service call.

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 We may collect and store the following personal information:

  • Name, email, address, telephone number, and (depending on the service used), move-in dates;
  • Transactional information (such as lease terms, lease parties);
  • Computer sign-on data, statistics on page views, and traffic to and from the Website; and
  • Other information, including IP address and other web log information.

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 Antler Pump & Motor Corporation, 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 Antler Pump & Motor Corporation. 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: