A friend visited the Pittsburgh Supercomputing Center, where he saw one of these. Said that they throw off a LOT of heat. Stainless steel braided piping is used to move the liquid cooling around.
Compare that to somewhere in the range of 5 to 25kw for 42 rack units for a more traditional mix of equipment in a rack.
Sounds like it consumes somewhere in the range of 2.5 to 10 times more than a normal server that would fit in the same space. 1.5kw per RU as compared to 0.12-0.6 per RU for "normal equipment".
https://www.anandtech.com/show/16626/cerebras-unveils-wafer-...