Water heaters with indication systems configured to provide one or more alerts to users

A water heating method comprising:

• obtaining, by a controller, inputs from a sensor, wherein the sensor is configured to detect an anomaly in a water heating system;
• determining, by the controller and based on the inputs, that a predetermined condition is met;
• and
• modifying, by the controller and based on the predetermined condition being met, a water flow or an output water temperature for a predefined time duration to provide an alert signal to a user.

A water heating method comprising:

• obtaining, by a controller, a hot water usage time duration from a timer, wherein the timer is configured to detect the hot water usage time duration;
• determining, by the controller and based on the hot water usage time duration, that a predetermined condition is met;
• and
• modifying, by the controller and based on the predetermined condition being met, a water flow or an output water temperature for a predefined time duration to provide an alert signal to a user.