Lifesystems Heatshield Thermal Bivi Bag could absolutely make the difference between an uncomfortable night and a disaster, says Peter Macfarlane. F rom my earliest days in the hills carrying a ...

So he chose a system designed by Harvest Thermal. Unlike systems that heat water and air separately, this one does both. One ultraefficient heat pump brings water up to 150 degrees Fahrenheit in a ...

Unlike photovoltaic panels, which can power your home, solar thermal panels are mainly used to heat water. But they’re smaller and more efficient. The technology converts 60 to 70 percent of the ...