A fluid heat exchanger (100, 200, 300, 400) comprising: a first tube (102, 202, 302, 402) defining a substantially conical coil, the first tube (102, 202, 302, 402) extending around a longitudinal axis of the fluid heat exchanger (100, 200, 300, 400), the first tube (102, 202, 302, 402) having at least one arcuate section that is laterally offset from another arcuate section of the first tube (102, 202, 302, 402) in a direction transverse to the longitudinal axis; a plurality of fins (104, 204, 304, 404) attached to an exterior surface of the first tube (102, 202, 302, 402); at least one fitting (216, 316) coupled to the first tube (102, 202, 302, 402) to enable fluid flow into and out of the first tube (102, 202, 302, 402) in order to transfer heat energy between a first fluid within the first tube (102, 202, 302, 402) and a second fluid on an exterior of the first tube (102, 202, 302, 402) proximate the first tube (102, 202, 302, 402) and the plurality of fins (104, 204, 304, 404); and characterized by the substantially conical coil being defined by a plurality of rings (210, 310, 410) including spaces between the plurality of rings (210, 310, 410) of the substantially conical coil; and a second tube (102, 202, 302, 402) defining the substantially conical coil, the first tube (102, 202, 302, 402) and the second tube (102, 202, 302, 402) extending along a similar path adjacent to each other; the first tube (102, 202, 302, 402) and the second tube (102, 202, 302, 402) connected to a first common fitting (216, 316) at a first longitudinal end of the conical coil and a second common fitting (216, 316) at a second, opposing longitudinal end of the conical coil. a first tube (102, 202, 302, 402) defining a substantially conical coil, the first tube (102, 202, 302, 402) extending around a longitudinal axis of the fluid heat exchanger (100, 200, 300, 400), the first tube (102, 202, 302, 402) having at least one arcuate section that is laterally offset from another arcuate section of the first tube (102, 202, 302, 402) in a direction transverse to the longitudinal axis; a plurality of fins (104, 204, 304, 404) attached to an exterior surface of the first tube (102, 202, 302, 402); at least one fitting (216, 316) coupled to the first tube (102, 202, 302, 402) to enable fluid flow into and out of the first tube (102, 202, 302, 402) in order to transfer heat energy between a first fluid within the first tube (102, 202, 302, 402) and a second fluid on an exterior of the first tube (102, 202, 302, 402) proximate the first tube (102, 202, 302, 402) and the plurality of fins (104, 204, 304, 404); and characterized by the substantially conical coil being defined by a plurality of rings (210, 310, 410) including spaces between the plurality of rings (210, 310, 410) of the substantially conical coil; and a second tube (102, 202, 302, 402) defining the substantially conical coil, the first tube (102, 202, 302, 402) and the second tube (102, 202, 302, 402) extending along a similar path adjacent to each other; the first tube (102, 202, 302, 402) and the second tube (102, 202, 302, 402) connected to a first common fitting (216, 316) at a first longitudinal end of the conical coil and a second common fitting (216, 316) at a second, opposing longitudinal end of the conical coil.