I ve seen some interesting heat exchangers that I think I can replicate, please let me know what you think about them and if you have other ideas or which one do you think I should chose.
For sure I will have to buy a torch and begin building some skill with those pipes.
https://www.alibaba.com/product-deta...093599136.html
https://www.olx.ro/oferta/pahlen-ab-...tml#66f8c215e6
and there are other designs that use multiple pipes, smaller in diameter, but can someone here help me get the correct sizing for it and maybe some other tips.