Carved into the rock beneath a Swedish city, a huge man-made cave system dating back to the Cold War is being used to heat local housing. Like many urban centers in Sweden, Vasteras operates a ...

If you're looking to make an investment in your home, a tankless water heater is a good place to start. Learn more about the energy-saving appliances here.

Hot-water system on the blink? Unless you really love cold showers, you're going to need a new one – fast. Do you want gas, electric, solar or heat pump? What about a storage tank or instantaneous ...