Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

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How Long Does a Water Heater Take To Heat Up?

Property owners in New York City must ensure tenants have an adequate hot water supply. This supply depends on the water heater output and size, but how long does a water heater take to heat up the water to begin with? Many factors go into the overall effectiveness of a water heater. Discover what contributes to heating times and how to preserve the supply of hot water for all your tenants.

How Long Does a Water Heater Take To Heat Up: 5 Factors Affecting Heating Time

1. Type of Water Heater

An average-size residential water heater takes between 30 and 80 minutes to heat up, depending on its fuel source and tank size. That said, the type of water heater or heating system your building uses plays a crucial role in the hot water supply and the time to heat.

A centralized system is relatively common in an apartment building and typically includes one or more centralized heaters. A standard centralized system includes tanks, heat pumps, and boilers and uses electricity, natural gas, or, less commonly, propane to heat the supply. In some modern systems, you can use solar power for heating.

Some buildings have individual unit heaters instead. While both individual and centralized systems usually depend on reservoirs for hot water, it is also common to find tankless water heaters in individual units. Tankless heaters are more expensive to install and maintain. However, they reduce the heating time for water and ensure a continuous hot water supply at so many gallons per minute.

While tankless water heaters are efficient with individual apartments, especially for on-demand hot water, they struggle to supply multiple units. Peak times of hot water usage can be especially difficult for tankless systems trying to serve too many tenants at once.

For apartment buildings, individual-unit water heaters are likely your best and most efficient option. The units reduce heating time, and as long as you appropriately size them for the apartments, tenants should have a continuous hot water supply when needed.

2. System Size

System size contributes to how long a water heater takes to heat up. The capacity is also critical to meeting apartment building or unit demands. The most important part of water heater selection is finding a balance between tenant needs, operating costs, and appliance lifespan. To determine the right size for your complex, you must calculate the building’s load.

A load calculation factors in the number of apartments in the building, number of bathrooms per unit, types of fixtures, and estimated peak usage patterns. A professional plumber from Calray Boilers can help you get the correct numbers to figure out water heater size and demands.

Water heater capacity matters for its heating time. An undersized water heater can’t heat fast enough and will run out of hot water too fast during peak times, leading to complaints. Also, the system will run almost constantly to maintain as much heat as possible. Such overworking causes excess wear, hot water delays, and premature failure.

That being said, “bigger is better” is not necessarily the case with water heaters. An oversized system may not be as disruptive and hold water temperatures steadier for longer. However, a larger tank can also waste energy by heating more water than is necessary. Because the system has excess hot water, it experiences more significant standby heat loss than smaller or appropriately sized systems.

3. Incoming Water Temperature

How long it takes a water heater to heat up depends in part on the incoming water temperature. Municipal supply lines travel underground to your property. The location of these municipal lines affects the temperature of the water entering your buildings. While the supply typically maintains a stable temperature throughout the year, it is significantly lower than what people want their hot water to be.

If the water heater is not an adequate size for the property or unit, more cold municipal water gets fed directly into the system during peak use times. The more municipal water is added to the system, the longer it takes to heat.

4. Desired Water Temperature

The higher the desired water temperature, the longer it takes to heat. OSHA recommends a hot water temperature of 122°F to prevent bacterial growth and spread. Many experts suggest a temperature of 120°F for safety and energy-consciousness.

Despite these recommendations, most water heaters have a factory setting of 140°F. The higher temperature not only requires a longer heating time but also increases the risk of scalding in older tenants and young children.

Some property owners deliberately keep temperature settings high to reduce heat loss throughout the plumbing supply system. If you worry about heat loss, consider installing adequate insulation throughout the property, specifically on hot water supply routes.

5. System Efficiency and Maintenance

The condition of the system also affects how long it takes a water heater to heat up. An efficient and well-maintained system will heat water faster and maintain the desired temperature for longer with less energy expenditure.

A poorly maintained system can have many issues that prolong or impair heating times altogether. The primary issue we see in these systems is sediment buildup. Sediment acts as an insulator and reduces efficient heat transfer between the heating element or burner and the water. It forces the water heater to work harder and for longer to reach a desired temperature setting.

Without regular maintenance, a water heater and its components may experience premature wear. Heating elements can degrade. Burners may become clogged and less effective. Corrosion may set in, affecting the tank’s heat exchangers and reducing the system’s overall lifespan.

How Long Does a Water Heater Take To Heat Up: Professional Assessments

Contact Calray Boilers To Keep Your Hot Water Flowing Fast

How long does a water heater take to heat up? Many factors contribute to the appliance’s heating time, not the least of which being its size compared to the size of the building. Calray Boilers can help you determine the proper water heater size and timing for your property. Contact us to schedule an inspection and ask about our annual service contracts.

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: