My new, green home is less than two years old (6000 sq.ft.). I have two Waterfurnace Envision units (3.5 ton and 5 ton) running 2 and 4 zones respectively. Both units stopped heating this winter and I had to run the propane fireplaces to keep the house warm until I could get the original contractor back in to check the units. They are telling me today that both units have leaking coils and will need to be replaced! So, needless to say I am NOT happy with Waterfurnace right now. I will be calling them tomorrow to see what, if anything they will do about this besides provide replacement parts under the warranty.