Dear Jim: We have teenage daughters who take long showers. Our water heating costs are sky high. We are on a tight budget, but want to use some solar water heating. Is there a do-it-yourself system we ...

Wrap the copper tubing around the burn chamber to add even more heat-capturing surface area. Concentrate the coils around the bottom third of the chamber to gain the most heat. My wife and I designed ...

There is no wrong way to build a first biogas digester, so long as it results in the unforgettable experience of seeing the miraculous blue flame of biogas for the first time. Soon afterwards, however ...