Flash steam generator

A steam generator for generating steam from a fluid, comprising

• an inner casing with a corresponding length;
• an outer casing, the outer casing being coaxially disposed about the inner casing and defining a closed space therebetween;
• and
• a heater coil which is a generator of heat disposed in the space between the inner and outer casings,
• wherein the heater coil is wound around the length of the inner casing in successive loops defining a gap between each successive loop of the heater coil, the space between the inner and outer casings being sized to sandwich the heater coil between the inner and outer casings to provide a closed flow path for the fluid in the gap defined by adjacent successive loops of the heater coil in direct contact with the fluid and adjacent portions of the inner and outer casings;
• and
• openings defined through the outer casing communicating with the defined flow path to allow inflow of the fluid and the outflow of the steam, through selected ones of the openings;
• and
• a hand-held housing, wherein the inner and outer casings and the heater coil are disposed within the housing.