How does a tankless gas water heater work ?

Need a repair or service on a tankless hot water heater ?  



  1. A hot water tap is turned on.

  2. Water enters the heater.

  3. The water flow sensor detects the water flow.

  4. The computer automatically ignites the burner.

  5. Water circulates through the
  6. heat exchanger.

  7. The heat exchanger heats the water to the designated temperature.

  8. When the tap is turned off the hot water stops.