126 whereas compartment 150 is substantially rectangular in horizontal cross section compartments 142 and 150 of tray 140 are in communication with each other in that water from compartment 142 readily flows therefrom into compartment 150 whereby the level of water in compartment 150 will always be a the level in compartment 142 housing 116 is provided with a rectangular shaped floor 160 which substantially seals oft the interior of housing 116 from compartment 150 of tray 140 except for an opening in which the lower portion of a steam nozzle 162 is seated as better seen in fig8 nozzle 162 has an enlarged circular lower portion 164 leading to a narrowed and substantially cylindrical jet opening 166 floor 160 has integrally formed therewith a depending wall 168 which extends perimeterically of the floor and projects downwardly into compartment 150 of tray 140 to form an evaporation chamber 169 the wall 168 is positioned in close proximity to the walls 170 of compartment 150 the lower edges of wall 168 also extend close to the floor 145 in compartment 150 but are spaced therefrom as to permit water in tray 140 and particularly compartment 150 to readily flow between compartment 150 and evaporation chamber 169 an electrical heating element 172 is provided in evaporation chamber 169 which when energized heats the water to boiling to generate steam therein which escapes chamber 169 through steam nozzle 162.