1. Water heaters.

Question 1

1. What does turn on and off tankless Water Heater?

Answer 1

1. Hot water tap is turned on.
2. Water enters the heater.
3. The water-flow sencer detects the entry of water into the unit, switching on computer.
4. The computer ignites the burner.
5. When the top is shut off, the unit shuts down.