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 ...

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 ...

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 ...