When a computer runs a group of programs, it can get very hot. Cooling the computer can cost a lot, so some scientists want to know one thing: What would happen if they use the heat(熱量) from the computer?

  Large Internet companies such as Google and Microsoft have thousands of computers. As people use these computers to look through information, they produce lots of heat, so they need huge cooling systems(系統(tǒng)).

  These systems send the heat into the air. A company in Holland(荷蘭) thought paying to make the computers work and then paying again to cool them were a waste of energy. So the company developed a special machine-the e-Radiator.Boaz Leupe, head of the company, says that the e-Radiator works as a heating system and saves money. He says that the energy is used twice-once to heat the home and once to cool the computer. He also says that users don't have to pay to cool their computers. Five homeowners(房主) in Holland are testing the heating system in their homes. "We pay for using the computer, so, in that way, homeowners get heat for free," Boaz says. Jan Visser is one of the homeowners. "lf you use the computer more, the e-Radiator produces more heat," he says. "It cannot provide enough heat if you don't use your computer often." But he is ready to try it. It's a great help for his family.

  The company says e-Radiators produce heat of up to 55C. lt says the system could save its users about 440 a year. That's really wonderful, right?