BTC miner under your desk

Some people are finding unique ways to make use of the residual heat released by BTC miners. This image shows how someone is heating their bath water with their mining rig. https://video-images.vice.com/articles/5afc7aa1f3cc4c0009ce4c56/lede/1526496876977-l5goioK.jpeg

I convinced my wife to put one in an unheated basement room. Noise isn't a problem, but efficiency is. I'm open to suggestions.