What are the options for hosting btw?
I am looking at 25 boards and there is a limit on how much heat I can host in my house.
-BrimStone
You would need more than a single 30A 240V circuit to power them all too.
Yes, assuming 400W per board at the wall, that's 10 KW.
The heat is not the biggest problem, you could always install large window extractor fans. Or liquid cool with a car radiator outside.
But 10KW power is alot:
If you're fortunate enough to be on 240V then that's 42 Amps.
120V supply and you need to carry 84 Amps.
In both 120 and 240 scenarios you will probably need a 3 phase house hookup and then run 3 * 2 phase lines from your house box spread over your PSUs. Get an electrician to do the house box wiring if you don't understand 3 phase, or be very careful and have some spare street box fuses on hand of the correct value.
10KW constant base power is alot, remember you will have kettles, toasters, other machines running on top from time to time, so expect it to peak at 15KW or more. You'd have a very warm winter though