The electricity is $0.02, and the price pr machine is $2100. The machines are located an hour driving from me so i have looked at them in real and have seen that they are in good working condition. The guy who has them need to sell them due to financial problems with a loan he has.

Hello. I have few S17PRO machines running pr today. Got an offer for 4 S17+ at a decent price. Based on the experience i have with the ones i have today, they worked flawless for over a year. My plan is to build a immersion cooling system for them. To use all the heat to heat up water and the house.
Or would it be better to look out for an S19PRO at a decent price?
I would Get thie 4 S17+ For halv the price of a new S19PRO..