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Firmware updates

How your Cala keeps its software up to date on its own, and how to see which version it runs.

Updated October 31, 2026

Your Cala keeps its own software (firmware) up to date. Updates download and install by themselves while your Cala is online, so there's nothing you need to do.

How updates work

  • Updates install in the background whenever your Cala is connected to Wi-Fi.
  • When an update finishes installing, your Cala restarts on its own.
  • If a new version doesn't work properly after it installs, your Cala goes back to the version it was running before.
  • There's no "check for updates" button. As long as your Cala stays online, it gets new versions automatically.

Find your firmware version

In the Cala app

  1. Tap the menu icon at the top left, then tap your home's name.

  2. Tap Manage Homes and choose your home.

  3. Tap Cala Water Heaters and choose your heater.

  4. The version is shown next to Firmware Version.

On your Cala's screen

  1. Press Down until SETTINGS is highlighted, then press Select. (If the screen is dark, press any button first to wake it.)

  2. With DEVICE STATUS highlighted, press Select.

  3. The version is shown next to Build:.

    STATUS screen with the firmware version next to Build:
    The version is next to Build:.

Updates during first-time setup

When your Cala is first connected, it checks for an update right away. Its screen shows FIRMWARE UPDATE with three steps: Check, Download and Install.

  • If there's nothing new, it shows Already up to date and moves on.
  • If there is an update, it shows Downloading update and then Installing update. Keep your Cala connected and powered. It restarts on its own when it's done.
  • If the update can't finish, the screen says what happened and tells you to press Proceed. Press Select to continue setup; your Cala tries again later.
FIRMWARE UPDATE screen with Check done, Download in progress, "Downloading update" and a progress bar
Downloading an update during setup.