It's hard to find a balance when there are requirements at both ends. You want effective cooling of the equipment and useful heat byproduct.
You can usually only do one effectively. The heat byproduct can be used as a secondary heat source. One example is a drone water tank
that warms water before going into the heated tank. Most drone tanks just use ambient heat to warm the ground water but a little extra
boost from mining waste heat can't hurt. An aquarium or swimming pool might also be a good use.
Of course, we can't want to take full advantage of two things. Either we have one or the other, both at the same time is difficult.
Now, I have some doubts about the efficiency of mining to heat water, especially in small miners.
Large mining centers, yes the heat generated could be useful for water heating.