People produce heat, all the time, from themselves and their equipment.
Even during light exercise the heat produced is 20 times that at rest.
Out of the 25,000+ fish species, only 22 are known to have a mechanism to produce heat.
As power lines carry more current, they produce heat through resistance.
Nearly all heat produced is conducted through the back side of the chip.
The brain generates about 16% of the total heat produced by the body.
The reaction also produces heat, at up to 500 degrees.
These produce heat and hot water but, in addition, they also generate electricity.
The heat produced by these can easily dry the paper to less than 6% moisture.
Once the gas is available, it can also be used by companies to produce electricity and heat for their factories.