Frequently asked questions.

What is CTA-2045?

CTA-2045 is an open communication standard that allows electric utilities and appliances to communicate for demand response and energy management.
It provides a universal interface that lets smart appliances—such as water heaters, HVAC systems, and EV chargers—exchange data with the grid through a plug-in communication module called a UCM (Universal Communication Module).

What is a CTA-2045 UCM?

A CTA-2045 Universal Communication Module (UCM) is a small device that plugs into a compatible appliance, enabling it to receive and respond to signals from a utility or energy management system.
The UCM handles communications, event processing, and secure messaging between the appliance and the grid.

What appliances support CTA-2045?

CTA-2045 is supported by many modern electric water heaters and HVAC systems manufactured by leading brands such as A.O. Smith and Rheem.
Check your appliance’s manual or look for a “CTA-2045 port” on the control panel.

What does the Vawkes CTA-2045 UCM do?

The Vawkes GridCube UCM connects a compatible appliance to the smart grid using the CTA-2045 standard.
It enables utilities to send load-control or demand-response signals, while also allowing homeowners to participate in energy-saving programs automatically.
Our UCM supports both wired CTA-2045 communication and wireless connectivity via Amazon Sidewalk, offering greater installation flexibility.

What is Amazon Sidewalk and why does it matter?

Amazon Sidewalk is a long-range, low-bandwidth wireless network built into many Amazon devices.
It extends connectivity beyond Wi-Fi and LTE range, allowing the Vawkes GridCube UCM to stay connected in garages, basements, and other areas where Wi-Fi or LTE may be unreliable.
This means easier installations and more consistent communication with the utility.

How does CTA-2045 benefit utilities?

Utilities use CTA-2045 to:

  • Reduce peak demand through automated load control

  • Improve grid stability and planning

  • Enable customer incentive programs

  • Simplify deployment by supporting a standardized interface

Because the interface is open and interoperable, utilities can integrate devices from multiple manufacturers without custom communication protocols.

How does CTA-2045 benefit consumers?

Consumers gain access to smart grid programs without replacing their appliance.
By adding a UCM, they can:

  • Participate in demand response or time-of-use programs

  • Lower energy costs

  • Support a more stable and sustainable power grid

Is CTA-2045 a utility-specific system?

No. CTA-2045 is an open industry standard developed by the Consumer Technology Association (CTA) and adopted across the utility and appliance industries.
It is designed for interoperability between multiple manufacturers and communication technologies.

Where can I learn more about CTA-2045?

For technical specifications and program details, visit:

How can I purchase or evaluate the Vawkes GridCube UCM?

You can contact our team through the Vawkes website to request product details, compatibility information, and pricing.
We support both utility-scale and OEM integration inquiries.