a heat exchanger for being removeably mounted on said exhaust pipe, said heat exchanger including {TAIL ~ a concaved bottom plate} curved to conform to the curvature of a portion of said exhaust pipe, a top plate spaced from said bottom plate, side walls extending between the edges of said top plate and said bottom plate for forming with said top plate and said bottom plate, {HEAD ~ a rectangular chamber} partially around said exhaust pipe, spaced nipples extending from said top plate outward away from said bottom plate in generally radial directions 
a heat exchanger for being removeably mounted on said exhaust pipe , said heat exchanger including { TAIL ~ a concaved bottom plate } curved to conform to the curvature of a portion of said exhaust pipe , a top plate spaced from said bottom plate , side walls extending between the edges of said top plate and said bottom plate for forming with said top plate and said bottom plate , { HEAD ~ a rectangular chamber } partially around said exhaust pipe , spaced nipples extending from said top plate outward away from said bottom plate in generally radial directions
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