A fluid heating system comprising: a heating chamber (A-1000) that receives and heats fluid to provide heated fluid; a dispensing device (B-1000) that dispenses the heated fluid, the dispensing device (B-1000) encompassing the heating chamber (A-1000); a thermostatic control device (E-1000) that regulates a power supply to the heating chamber (A-1000); a drain (B-1 100) open to an external environment, and a pressure regulating valve (C-1000) articulable between an opened position and a closed position, wherein in the opened position, passage for the heated fluid is provided between the drain (B-1100) and the heating chamber (A-1000), and in the closed position, passage for the heated fluid is prevented between the heating chamber (A-1000) and the drain (B-1100) when a pressure in the heating chamber (A-1000) is below a predetermined pressure threshold; characterized in that with the pressure regulating valve in the closed position, passage for the heated fluid is provided between the heating chamber (A-1000) and the drain (B-1100) when the pressure in the heating chamber (A-1000) is above the predetermined pressure threshold; and the fluid heating system further comprises an energy recovery device (D-1000) that harvests mechanical energy provided by a flow of the heated fluid from the heating chamber (A-1000) to the dispensing device (B-1000) and generates electrical energy to power the thermostatic control device (E-1000). a heating chamber (A-1000) that receives and heats fluid to provide heated fluid; a dispensing device (B-1000) that dispenses the heated fluid, the dispensing device (B-1000) encompassing the heating chamber (A-1000); a thermostatic control device (E-1000) that regulates a power supply to the heating chamber (A-1000); a drain (B-1 100) open to an external environment, and a pressure regulating valve (C-1000) articulable between an opened position and a closed position, wherein in the opened position, passage for the heated fluid is provided between the drain (B-1100) and the heating chamber (A-1000), and in the closed position, passage for the heated fluid is prevented between the heating chamber (A-1000) and the drain (B-1100) when a pressure in the heating chamber (A-1000) is below a predetermined pressure threshold; in the opened position, passage for the heated fluid is provided between the drain (B-1100) and the heating chamber (A-1000), and in the closed position, passage for the heated fluid is prevented between the heating chamber (A-1000) and the drain (B-1100) when a pressure in the heating chamber (A-1000) is below a predetermined pressure threshold; characterized in that with the pressure regulating valve in the closed position, passage for the heated fluid is provided between the heating chamber (A-1000) and the drain (B-1100) when the pressure in the heating chamber (A-1000) is above the predetermined pressure threshold; and the fluid heating system further comprises an energy recovery device (D-1000) that harvests mechanical energy provided by a flow of the heated fluid from the heating chamber (A-1000) to the dispensing device (B-1000) and generates electrical energy to power the thermostatic control device (E-1000). <EOS>