A versatile source of radiant heat for heating test tubes, crucibles and small flasks, irrespective of their shape. Comprising corrosion resistant metal housing and a spiralled nickel chromium wire element within a refractory casing. A top cowl deflects heat away from the hand. The cowl is removable for heating crucibles and the unit can be held at the base by hand. Maximum power rating 400W. Element temperature 800 to 1000°C. Height 180mm. For 230-250V a.c. single phase supplies. Requires, but does not include, a controller.