That's interesting. My search for products in this category turned up the Qarnot company which also has a "digital boiler". Apparently, it's a general purpose Linux server that can be used to mine any coin or perform any type of computation.

https://qarnot.com/en/heating-water/

Not sure if it's even available outside Europe. I wonder if it's possible to somehow replicate this with a home server. How is it pumping the heat out of the components and into the water system?