A liquid heating appliance 2 for providing heated liquid on demand comprising: a flow heater 4 with entrance 4a, exit 4b, a liquid reservoir 6 having a maximum liquid fill level 14; a pump 8 for conveying liquid from the reservoir through the heater; and an outlet for dispensing heated liquid from the exit of the heater. The liquid heating appliance further comprises a bi‑directional flow path from the reservoir to the outlet, the bi-directional flow path passing through the pump and the heater, the heater entrance is higher than the maximum liquid fill level of the reservoir. The heater may comprises and arcuate shaped tube 16 extending upwards to an apex 26 that is higher than the entrance, and the exit of the heater is higher than the maximum liquid fill level of the reservoir. The bi-directional flow may comprises a user-adjustable restrictor valve, preferably arranged between the pump and the flow heater. Optional means for delaying operation of the pump to convey liquid from the reservoir through the flow heater after energising the flow heater, depending on the temperature of the heater and time used, by using a a thermo-mechanical switch, such as a bimetallic actuator
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