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Not enough hot water? Capacity and predictive controls

Get more hot water from your Cala by changing its tank capacity or turning predictive controls off and on.

Updated October 31, 2026

If you regularly run short of hot water, you can tell Cala to keep more hot water in the tank. You do this on your Cala's screen, under TEMP CONTROL.

How it works

Cala's predictive controls learn how your home uses hot water and adjust the tank temperature to match. While predictive controls are on, Cala decides how much hot water to keep ready.

When predictive controls are off, or while Cala is still learning in its first month, Cala keeps the tank at the capacity you choose: NORMAL CAPACITY, HIGH CAPACITY or EXTRA HIGH CAPACITY. See Your first month: how Cala learns.

So when you choose NOT ENOUGH HOT WATER, your Cala shows one of two screens:

  • PREDICTIVE CONTROLS, if predictive controls are running. Turn them off to choose a capacity yourself.
  • TANK CAPACITY, if they aren't. Choose a higher capacity.

Open Not Enough Hot Water

  1. On your Cala's screen, press any button to wake it. The Home screen appears.

  2. Press Down until SETTINGS is highlighted, then press Select.

  3. Press Down until TEMP CONTROL is highlighted, then press Select. The TEMPERATURE SETTINGS screen opens.

    TEMPERATURE SETTINGS screen with NOT ENOUGH HOT WATER highlighted and TOO HOT / TOO COLD below
    The TEMPERATURE SETTINGS screen.

  4. With NOT ENOUGH HOT WATER highlighted, press Select. You see either PREDICTIVE CONTROLS or TANK CAPACITY. Follow the matching part below.

If you see Predictive Controls

PREDICTIVE CONTROLS screen with ENABLE highlighted and DISABLE below
The PREDICTIVE CONTROLS screen.

The screen says Cala can adjust the water temperature based on your usage, and that you can turn this off and set it yourself.

  1. Press Down until DISABLE is highlighted, then press Select. Your Cala turns predictive controls off and goes back to the Home screen.

  2. Open SETTINGS, then TEMP CONTROL, then NOT ENOUGH HOT WATER again. This time you see TANK CAPACITY.

  3. Follow the steps in the next part to choose a capacity.

If you see Tank Capacity

TANK CAPACITY screen with NORMAL CAPACITY highlighted, then HIGH CAPACITY and EXTRA HIGH CAPACITY
The TANK CAPACITY screen.

  1. Your current capacity is highlighted when the screen opens.

  2. Press Down until HIGH CAPACITY or EXTRA HIGH CAPACITY is highlighted.

  3. Press Select. Cala saves your choice and goes back to the Home screen.

Turn predictive controls back on

  1. On your Cala's screen, open SETTINGS, then TEMP CONTROL.

  2. Press Down until ENABLE PREDICTIVE CONTROLS is highlighted, then press Select. The PREDICTIVE CONTROLS screen opens.

    TEMPERATURE SETTINGS screen with ENABLE PREDICTIVE CONTROLS highlighted as the third button
    ENABLE PREDICTIVE CONTROLS only appears after predictive controls were turned off.

  3. With ENABLE highlighted, press Select. Your Cala goes back to the Home screen and goes back to predictive heating.