Flow control for a continuous-flow water heater

Flow control for a continuous-flow water heater, comprising a water part (1) controlling the passage of water to a heat exchanger wherein the quantity of water can be manually set by an operating element (8) attached to a spindle (7) projecting from the water-carrying housing (5), a gas part (2) with an electronic ignition and monitoring device (3) controlling the gas flow as a function of the passage of water to an atmospheric burner, and a mechanical transmission which transmits, as a function of the passage of water and, preferably in each case by means of a Venturi nozzle housed in the water-carrying housing and a membrane, a steering movement initially from the interior of the water-carrying housing (5) to the exterior and then from there into the gas-carrying housing (6) to a valve controlling the amount of gas, characterised in that a switching element (9) is rotatably mounted on the spindle (7), wherein a rotary movement of the operating element (8) can be transmitted by driver (10;11) to the switching element (9), and that the switching element (9) has a switching contour (13), by means of which a fixedly arranged microswitch (14) can be actuated which shuts off the gas flow to the burner by means of the electronic ignition and monitoring device (3) and an electrically actuatable valve.