Thanks Tech - I am already leery about this product. They [Mfg] are asking us to install their product, but are not giving us all of the details required to provide proper pricing. They are telling us how long the system takes to install and are trying to get us to offer pricing based ONLY on information they provide. That is a red light to us right off the top. Then I find, though I have searched, I am unable to locate any contractor who has heard of or installed this system!! Second red light. The mgf gave me a reference to contact but it turns out the reference is someone in their back yard. Not totally reliable and 3rd red light. I think we may pass on this unless I can get additional information, and that looks like a lost cause.