Abstract: The invention is directed to a heating block (100) for a continuous flow heater in which a water flow system with channels is arranged in the heating block (100). A heating path (300) of the water flow system forms a hottest channel (340) with a hottest heating element (341) during operation of the continuous flow heater. The hottest channel (340) is arranged downstream of at least one channel (310, 320, 330) of the heating path (300) in a flow direction (110). The hottest channel (340) of the heating path (300) is surrounded by at least four channels which are located between an outer surface (120) of the heating block (100) and the hottest channel (340). Accordingly, the hottest channel (340) of the continuous flow heater is surrounded by at least four channels and is shielded relative to an air space (160).