| 摘要 |
An electric heater is disclosed which comprises a heating resistor wire (15). The heating resistor wire (15) is made of iron or iron-based alloy of low resistivity, is arranged within a tubular double-wall housing, comprising an internal wall (1) and an external wall (7). The tubular double-wall housing is open at both ends, and is provided with a protective metal grid at the upper end. The heating resistor wire (15) is held by ceramic rings (24) fixed to a metal frame and is folded to sections in parallel to the longitudinal axis of the tubular double-wall housing, along the periphery of the ceramic rings. The electric heater is provided with a control unit in the form of a separated thermostat built in its standard mains plug. |
