Apparatus for producing a heating fluid

A heat exchange apparatus which comprises:

• an external, generally cylindrical hollow insulating housing having an upper end and a lower end;
• heater means disposed adjacent the lower end of said housing in a position to direct heat along the central axis thereof;
• and
• a heating coil assembly having an upper end and a lower end and disposed within said insulating housing and including:
• a radially outer tubular coil bank including helical convolutions of substantially uniform diameter frictionally engaging the inner wall of said generally cylindrical housing;
• a radially inner tubular coil bank of helical convolutions of substantially uniform diameter spaced radially inwardly from said radially outer coil bank and disposed above said heater means;
• and
• an intermediate tubular coil bank of helical convolutions disposed between, and interconnected to, said radially outer and said radially inner coil banks, said intermediate coil bank including a series of interconnected annular convolutions of axially increasing diameter from the upper end of said intermediate coil bank to the lower end thereof;
• and
• a baffle frame assembly supported adjacent the upper end of said housing and supporting said intermediate and inner tubular coil banks and positioned for deflecting heated air radially outwardly with respect to the central axis of said housing to more efficiently heat the several convolutions in said heating coil assembly.