New DOE Mandates Efficiency Standard for Circulators

The primary goal of this ruling is to improve energy efficiency in heating, ventilation, and air conditioning (HVAC) systems. AC induction motors, while reliable, are less efficient than newer ECMs that are designed to adjust their speed based on system demand, leading to significant energy savings over time and a reduction in greenhouse gas emissions. 

Standard AC induction motor circulators are being phased out and replaced by high-efficiency ECM circulators.

View affected circulators

All circulator manufacturers, along with engineers, contractors, and building owners who specify, install, or service circulators.

ECMs are a more advanced type of motor that uses electronic controls to regulate motor speed and efficiency. Unlike AC induction motors, ECMs provide variable-speed control, which allows circulators to adjust to the specific needs of a system, improving both performance and energy efficiency. They use permanent magnets to reduce the overall power consumption while maintaining the same level of performance. 

• More Options: The industry has been introducing circulators with ECMs over the past decade, and more models with different sizes and performance capabilities will be introduced before the 2028 deadline. You can expect a wider range of choices to meet your specific needs. 

• Improved Energy Efficiency: ECM circulators are significantly more energy-efficient than their AC counterparts. This will translate into lower operating costs for customers, especially in applications that require variable flow or constant demand. 

• Compatibility: While ECM circulators are highly efficient, they may require different installation or setup considerations compared to traditional AC circulators. It’s important to consult with your HVAC professional to ensure compatibility with your current systems. 

• Ongoing Support and Upgrades: Manufacturers are working to ensure that replacement circulators with ECM technology will meet or exceed the performance of existing models. Additionally, service and support for older systems will continue through the transition period. 

• Stay Informed: As the deadline approaches, make sure to stay updated on product offerings, installation guidelines, and available rebates or incentives. 

• Plan for the Future: If you are purchasing or replacing circulators, now is the time to start considering ECM models that meet or exceed the upcoming DOE standards. While AC motors are still available, they will no longer be produced after May 2028. Switching to ECMs sooner rather than later will offer long-term cost savings. 

• Check System Compatibility: If you’re thinking about replacing existing circulators or upgrading your system, consult with an HVAC professional (rewrite to audience) to ensure that the ECM circulators will be compatible with your existing infrastructure. 

No. If you already have a circulator with an AC induction motor installed the DOE ruling will not require you to replace it before 2028. However, you may want to consider upgrading to an ECM circulator before the deadline to take advantage of energy savings and avoid discontinued standard efficiency products. 

While ECM circulators tend to have a higher initial cost than AC induction models, their increased energy efficiency will result in lower operating costs over time. In many cases, the energy savings can offset the higher upfront cost. Additionally, there may be rebates or other incentives made available through your state or local utility company to help with the transition. 

HVAC professionals will need to adapt to the new technology by: 

• Gaining knowledge of ECM installation, configuration, and troubleshooting. 

• Understanding the differences between AC induction motors and ECM circulators to provide the best solutions for customers. 

• Staying up to date on any new regulations, certifications, or training programs related to ECMs. 

See info on the HI Energy Rating Label, or visit https://tacocomfort.com/leader-in-high-efficiency-circulators

No, the rulemaking fell outside the timeframe of a rulemaking which could be changed by executive order. It will go into effect on May 22, 2028. 

You can find detailed information through the HI Incentive Database and on our microsite. We also recommend checking directly with your local utility, as programs can vary by region. Most incentive programs are applied as an instant discount at the wholesaler counter at the time of purchase, rather than through a mail-in rebate. 

Although Canada has not officially announced an effective date, they have in the past harmonized with almost every DOE rulemaking within the HVAC space and we expect they will do the same for circulators on the same May 22, 2028 effective date as the United States. 

No, the energy efficiency metrics/ratings are based on different testing methodologies, have different rating nomenclatures (CEI in US vs EEI in EU), and different compliance thresholds. The EU standards also do not include circulators used in domestic hot water recirculation systems, where the US regulations do not exempt any circulators based on application. 

For more information, visit https://tacocomfort.com/leader-in-high-efficiency-circulators
or consult with your HVAC contractor. As the transition to ECM technology progresses, industry resources, product manuals, and installation guides will be readily available.