The backup water heater for a thermosiphon-type solar water heater works through an electronic card that initiates the operation of the heater when a bimetallic cable detects a temperature below 38 ° C and there is a demand for water by means of the water detector. flow through the tank, attached to a cylindrical collector, to transfer between 85% to 90% of the heat energy of the burner, which is gradually ignited by an electric spark emitted by a spark plug connected to the electronic card, which in turn sends the opening signal of the gas supply valve. Once the burner is lit, the electrical current generatedby the first spark plug it is transformed by the deionization effect changing the polarization of the current and detected by another spark plug that emits the change signal to the electronic card. If the current change signal is not detected by the cardthe system crashes and after 2 minutes the system restarts and if in two more attempts the signal is not detected, the card will block the equipment and mark a visual signal indicating an error in the system. If the water heater works properly, the card will emit a visual signal. At the moment that the bimetallic cable detects a temperature higher than 50 ° C, the card will stop the operation of the water heater until a new temperature cycle is restarted.
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