thanks for all of the help and guidance
I think on reflection i didn't know how complex immersion was and i think i am going to do air cooled with lots of acoustics to reduce the noise
If you want to use air cooling, then read reviews about different models. For example, if you want to use Bitmain Antminer T21, then these ASICs have certain shortcomings that are better to fix before mining. Good firmware has already appeared for the T series and it would be better to replace the factory thermal paste on the chips.
with proper mods to the t21 i get 17 watts a th.
i listed three of them on my ebay account
as I upgraded to the s21xp
this is the listing for the t21s
https://www.ebay.com/itm/1569845200651 phase not 3 phase
2 boards around 128th and 2400 watts
but you can dial them down to
60th and 1300 watts and lower fan speeds if you want.