I am a True Believer. For over twenty of your years, I have studied and sought the Tankless Water Heater. They instantly provide hot water on demand, and have models powered by either electricity or gas. We installed one a couple of years ago, and have been happy with the results, though the model we got is slightly smaller than would be ideal for our household. I have been trying to buy a larger propane burning unit as an upgrade, and even filled out the Rinnai dealer finder online. Their local guy called me, and proceeded to talk me out of a tankless, and into installing an old-style boiler. Said it would be more economical.
It is to laugh.
Which will be more economical over time: a boiler that keeps water hot 24 hours heating, then reheating as it cools, for water usage of an hour to an hour-and-a-half out of the day, or a heater with no tank, that supplies the precise amount of hot water you need, when you need it?
I have had two dealers in our area, including Home Depot, to try to convince me that the old-style heat it and hold it boiler is the way to go.
Feh. I am suspecting a conspiracy here.