Startup GMZ Energy raises $14 million to make materials that convert heat to electricity, including a solar hot thermal product and chips to draw electricity from car exhaust pipes. Martin LaMonica is ...

The author uses a pump with a garden hose outlet to supply water to a mounted showerhead. Construct a simple, inexpensive rainwater shower system heated with an off-grid solar water heater. If you ...

Solar water heaters work by absorbing sunlight in solar collectors and saving the heated water in a storage tank. Both active and passive solar water heaters are available. Active systems are ...