Woodstove Heat Exchanger: I wanted to build this heat exchanger to reclaim some of the heat that is lost up the chimney of my wood stove. I use the wood stove to heat my workshop during the winter months . I have seen heat exchanger units available in stores for http://estufas-de-lena-baratas99875.dbblog.net/26734144/todo-acerca-de-estufas-de-le-a-para-exterior