I encourage "out of the box" thinking when it comes to saving money on bills. I used to work for a TV show doing HVAC and saw alot of different ideas over the years. Some were really great, and some worked, but didn't save money in the end. I could go on for hours about some of these ideas, and you guys will probably hear about them in a few years. but as far as the instantaneous HWH go....I love them. But, again, as mentioned....weigh the costs out and see if it's worth it. I see them work great time and time again, but if you have a small ranch with normal water usage....is it really needed/worth it ?? See my point ? As with any new technology, there are differences. Installing pros. should be aware of these before installation, instead of just assuming everything is the same as the older technology. Water treatment might be needed for proper performance and dependability.