I have found the device I saw from a show earlier this year in your archives. I am very interested in the weather responsive control unit for the hydronic heating system. I was wandering if this will work with a base board water heat system that has copper throughout. I have read discussions where concerns about return temperatures and condensation can cause problems. Which Tekmar unit should I use? My house is 1 1/2 stories, about 1750spft, the upstairs and downstairs are not separated at the 'boiler'.