Double walled, inside made of stainless steel 304 grade and outside mild sheet painted with attractive stove enamel. Temperature is controlled by a hydraulic thermostat from 5ºC above ambient to 100ºC with a sensitivity of ± 0.5ºC fitted with ISI mark Tublar Element. Bath consists of 2 pilot lamps & on/off switch, to work on 220/230 Volts