DOE is adopting new standards for circulator pumps, whereby every circulator pump manufactured or imported into the United States from May 22, 2028, onward must meet a Circulator Energy Index (CEI) of 1.00 or better. This means that manufacturers will no longer be permitted to produce standard efficiency circulators that use AC induction motors, an electric motor that uses alternating current (AC) to create a rotating magnetic field in the stator.  

The DOE rule applies to covered pumps manufactured starting on the compliance date. It does not require building owners to replace working pumps on May 22, 2028. For a future replacement, the practical question is which compliant model meets the system’s performance and installation requirements.

The primary goal of this standard is to reduce energy consumption and carbon emissions. The DOE has stated that shifting to Electronically Commutated Motor (ECM) [NX1] will result in significant conservation of energy in residential and commercial HVAC systems. The current industry models by contrast – AC induction motors – are less efficient and cannot meet the new efficiency index. 

Traditional AC features fixed-speed operation, higher energy use, efficiency drops at partial load and may require additional controls to perform at part load, increasing installation time and cost. Conversely, ECM offers a wider operating range, reduced energy consumption and integrated speed control. 

Fixed speed alternating current (AC) motors use a sinusoidal current in the stator windings to create a rotating magnetic field. This field interacts with conductors in the rotor, inducing an electromotive force and generating a second magnetic field that drives rotation. Because the magnetic field from the rotor lags that of the stator, a slip occurs, causing energy loss and higher energy costs, particularly at part load conditions.

By contrast, electrically commutated (EC) motors use an electronic control system to create and manage the rotating magnetic field in the stator. The field interacts with permanent magnets embedded in the rotor, inducing rotation and eliminating any slip losses. The result is higher efficiency and reduced energy consumption along with integrated speed control.

In addition to improved efficiency and lower energy costs, upgrading to ECM reduces the need for multiple pumps in distributive hydronic systems. Additionally, you can use one pump with variable speed operation to cover multiple zones rather than having an individual pump for each zone or using valves that can result in efficiency losses in each zone.

We’ve designed many of our existing products as an exact replacement for current models. The e-90ECM, for instance, features a direct flange‑to‑flange, in‑line design that allows for easier replacement in compact mechanical rooms, while the ecocirc 20-18 is designed as a universal retrofit circulator that can replace up to 70 different standard residential wet-rotor circulator models. 

While an ECM may introduce settings that are unfamiliar to contractors who are used to older circulators, installation still begins with the fundamentals: select the pump for the system, install it correctly and verify its operation. What is a standout feature of the ECM motors is their high efficiency design that drives system simplicity: integrated variable-speed intelligence combined with optimized pump hydraulics, advanced control, built-in dry-run protection and smart drives that continuously modulate speed to match real-time flow and head requirements.  

Early planning gives engineers time to update documents, contractors time to understand replacement options and owners time to budget using realistic installation and operating costs. It also gives everyone a chance to identify retrofit constraints before a pump fails and the decision becomes urgent. 

Contact or find your local Bell & Gossett rep to learn more about the standard or compliant products.