ANSWER TO QUESTION NUMBER 1
This is by far the most important question to be answered.
The original tankless water heaters were developed to be used for a single fixture i.e. a single sink or shower. The temperature control wasn't and isn't suitable for multiple fixture use (i.e. a whole house) but a majority of electric tankless water heaters still use modified versions of this earliest technology.
Almost any company can find friends, employees, or business associates to provide testimonials for their product but it is very difficult to introduce new and innovative technology that earns the national and international recognition that will demonstrate to you that it is a mature and proven product.
It's for this reason that a consumer should look for the obvious. Is this product's technology patented and if so what is the patent number(s). With this information you can go directly to the U.S. Patent Office site (provided below) enter the number of the patent (is this really new and continuingly improving technology?) and hit search.
When the patent comes up you can scroll down through the ABSTRACT, then Claims until you get to the Field of Invention for a complete a description of why the inventor believes his technology is important.
This is so much better than listening to sales hype and more fun too.
Here?s the United States Patent Office web site,
