Heat Exchanger Tech Tree of Choices: Difference between revisions
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=Helical= | =Helical= | ||
*Copper | *Copper inside a chimney with propane - [https://www.youtube.com/watch?v=-wHkZp31by8] | ||
*Copper outside a chimney within shroud - [https://www.youtube.com/watch?v=_pnuyEkM0xg] |