Abstract: The forced recirculation solar water heating system with a backup water heater works through an electronic card that initiates the operation and activation of the water recirculators when there is a setpoint temperature difference between the panel and the storage tank detected by means of a bimetallic cable connected at one of the top ends of the panel and another bimetallic cable at the upper part of the storage tank. This storage tank has a series of safety check valves that prevent temperature loss due to hot water backflow to the hydraulic network or due to natural reverse recirculation, thus avoiding excess pressure in the system.

Abstract: A backup water heater for installation downstream of a water outlet of a thermosiphon solar water heater includes a corrosion resistant tank having a fin heat exchanger. A burner is supplied with gas from a gas feed valve system that includes at least one electrovalve connected to a cast body configured. A bimetallic temperature detector is disposed to detect the temperature of water in the tank, and a flow detector is disposed so as to activated by water flow through the tank. A first spark plug ignites the burner, and a second spark plug positioned to detect current changes in the first spark plug generated by ionization effect after the burner is ignited. An electronic controller is in operative communication with the various components to send a current to the first spark plug upon detection of a low setpoint temperature from the temperature detector and a detected setpoint flow from the flow detector.

Abstract: A water heater with an ionized ignition system includes an electronic controller in operative communication with a burner electrovalve, temperature detector, flow detector, and first and second spark plugs. The electronic controller is configured to ignite the water heater burner when a temperature detected by the temperature detector is less than (by preset margin) a desired water temperature input to the electronic controller by a user, and a). upon a flow demand signal from said flow detector, b). according to a time schedule input to said electronic controller; or c). when a remote control is actuated by the user.