Welcome to Pro-Size, the new online water heater sizing and product selection software from A. O. Smith. You can begin by selecting one of the Application types shown below, and Pro-Size will guide you through the process. Additional tools such as the Payback Calculator are available to further assist in the selection of the best A. O. Smith heater for your project.

Disclaimer: The A. O. Smith Pro-Size sizing program is a tool that can be used to estimate water heater requirements for many common applications. Pro-Size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. It is the sole responsibility of the system designer to select the correct products needed for the specific application. A. O. Smith reserves the right to make changes to Pro-Size without notice. For more see Terms of Use.

Copyright © 2014, A. O. Smith. All Rights Reserved.     Copyright © 2014 Avenir Software Inc. All Rights Reserved.
A. O. Smith reserves the right to make product changes or improvements at any time without notice.