TC
Get steel tube from local hydraulic mob ¾” or 20mm and buy el cheapo tube bender from plumbing store, it will work fine. Use a header arrangement it’s about getting the surface area up as much as possible
Or simply add flat bar to your current pipe and fully weld. (not easy with galv)
If you want faster say half the time measure what you have now and add twice as much area (pipe).
And if you want faster add more area
Stainless is an option but you need a lot more tube for the same result it is a terrible U value compared to steel.
Thermo will work the opposite to your setup (hi temp = lower).
Hope I make sense
Good luck
Get steel tube from local hydraulic mob ¾” or 20mm and buy el cheapo tube bender from plumbing store, it will work fine. Use a header arrangement it’s about getting the surface area up as much as possible
Or simply add flat bar to your current pipe and fully weld. (not easy with galv)
If you want faster say half the time measure what you have now and add twice as much area (pipe).
And if you want faster add more area
Stainless is an option but you need a lot more tube for the same result it is a terrible U value compared to steel.
Thermo will work the opposite to your setup (hi temp = lower).
Hope I make sense
Good luck