How much electricity is being used by crypto-currency miners?

a lot but less that all the computers on the world

Yeah, but at least most of that heat stays in the room where it is useful.

At least those computers are generally doing something useful.

i'm not sure why the crypto-mining space heater appliances aren't taking off, there are several models on the market now.
for example (just first result) [link to www.heatbit.com (secure)]

Its not taking off because say if I was running it it would cos £11.76 a day/£341 a month just to run it.

Some coins use no proof of work

Enough gpu cycles to render padme amadala nude in every death star holodeck and capitol ship.

Apparently you've never been in computer lab space where such heat is NOT "useful" and must be removed. Your ignorant generalizations betray you.

Just as they do on your stupid chemtard threads.