It seems that every week there are more and more strange information about the possibilities of mining Bitcoin.
Suppose one Antminer S9 uses 1375 W / h and produces about 0.6 BTC per year. To obtain one Bitcoin per year, 2292 W / h or 27.5 kW / h are required to produce 1 BTC per month. This means that we need 45 833.33.
Thus, by slightly rounding the numbers, to get one Bitcoin per month, heat from 46,000 people is needed.