A liquid heating device, for use with an induction hob, comprises a liquid heating vessel and a ferromagnetic heating plate (5) arranged to be located inside the vessel adjacent to the base (3) of the vessel. The ferromagnetic heating plate (5) is arranged to be movable vertically in a substantially perpendicular direction away from the base (3) of the vessel and return. An arrangement to lift the ferromagnetic heating plate comprises a thermally sensitive actuator (11, 12, 14, 15, 16), wherein the ferromagnetic heating plate (5) is mechanically coupled to the thermally sensitive actuator. The thermally sensitive actuator comprises a means to store energy (11), a steam chamber (13) fluidly connected to the vessel, and a releasable latching mechanism (15) for the actuator which incorporates a thermally sensitive device (14) set to operate at a predetermined temperature when influenced by the proximity of steam entering the steam chamber (13) from boiling water in the vessel. The thermally sensitive actuator further comprises means to facilitate a manual intervention of the actuator's operation and permitting a user to set or reset the actuator's position.

A liquid heating appliance for placement on an induction hob includes a liquid vessel, a ferromagnetic heating plate mounted within the vessel by a lifting mechanism, and a thermally sensitive actuator. The lifting mechanism is operable to move the ferromagnetic heating plate upwards within the vessel in response to the thermally sensitive actuator detecting that the heating plate exceeds a predefined temperature.

A liquid container and heating element may be capable of boiling a liquid. A heating element is built into the container and/or the heating element and container may be modular. Optionally, the liquid heating system may be functionable without being plugged in to an electricity source. For example, it may be portable and/or battery powered. Optionally, there may be insulation between the power supply (e.g., battery) and the heating element. Optionally, the electrical elements may be configured for a high current and/or low voltage. Optionally, the liquid heating system may be insulated to keep the contents in a desired temperature. For example, a steam cover may cover a steam hole for when the heating unit is not active and/or may be automatically removed when the heating unit is active.

A liquid heating device includes a liquid heating vessel and a ferromagnetic heating plate arranged to be located inside the vessel adjacent to the vessel base. The heating plate is arranged to be movable vertically away from the vessel base. An arrangement to lift the heating plate includes a thermally sensitive actuator. The heating plate is coupled to the thermally sensitive actuator. The thermally sensitive actuator includes a means to store energy, a steam chamber fluidly connected to the vessel, and a releasable latching mechanism for the actuator which incorporates a thermally sensitive device set to operate at a predetermined temperature when influenced by steam entering the steam chamber from the vessel. The thermally sensitive actuator further includes means to facilitate a manual intervention of the actuator's operation that permits a user to set or reset the actuator's position.