I just bought a 5-zone Everhot manifold and have not installed it yet. It looks like a well made product and should take care of the heat for my garage. I gave it 3 stars becaue there is absolutely no information packed with it. It is fairly self-explanatory but I still have a few questions that a basic instructon sheet may answer. or possibly provide a tech service # to call\ with questions. I would venture a guess that this is a chinese made item from the type style on the supply and return manifolds.