"BUT as I was field testing the unit I was called everything under the sun."
Good for you on a bit of redemption. I would encourage anyone with an ounce of humilty to go back and re-read the first few pages of this tread. To say you were treated unfairly would be an understatement. The sheer amount of ignorance and grandstanding being purveyed as genuine knowledge is laughable as people chime in and pile on without a full understanding of how a tankless water heater operates. Having sold and installed hundreds of tankless water heaters, I would consider myself somewhat of an expert on them by now, but there's nothing to be gained by engaging in many of the knuckleheaded comments I've seen here.