Heat exchanger for combustion engines including a housing containing a refractory tube within a dividing tube encircled by at least one coiled tube

A heat exchanger comprising a housing having a top panel, a bottom panel, two side panels, a front panel, and an end panel;

• said housing further comprising therein:
• a heating manifold formed by a refractory tube, wherein said refractory tube is configured in perpendicular relation to and extending from said front panel such that said refractory tube includes an opening within said housing;
• a dividing tube that is configured in perpendicular relation to and extending from said end panel such that said dividing tube defines an opening within said housing within which is disposed said refractory tube;
• an energy retention disc disposed along the internal wall of said end panel, and thus substantially perpendicular to said dividing tube;
• at least one coiled tube encircling said dividing tube;
• and
• at least two exhaust ports disposed within said end panel and with one of said two exhaust ports disposed between said dividing tube and said top panel and the other of said two exhaust ports disposed between said dividing tube and said bottom panel, wherein said at least one coiled tube is disposed so as to carry a working fluid through said housing and the number of coils within said at least one coiled tube within said housing is within the range from 25 to 45.