Solar water heaters, which are generally used in tandem with electric or natural-gas heaters, can knock 50 to 80 percent off your water-heating costs, the Department of Energy and industry sources say ...

German startup Nexol Photovolthermic has released a new hybrid solar water heater for residential applications. The NEX RS series comes in four sizes: 80 liters, 120 liters, 200 liters, and 300 liters ...