<p>A radiant electric heater comprises a dish-shaped enclosure (1) formed of a first thermal insulation material and having a base (3) and a peripheral wall (5) and at least one upwardly-extending protrusion (7) formed in the base and defining a channel (9) in the base within the peripheral wall. A layer (11) of a second thermal insulation material, having greaterthermal insulation properties than the first thermal insulation material, is provided in the channel. A radiant electric heating element (13) is supported on or in the layer of the second thermal insulation material.</p>
