Tankless water heaters, also known as combination boilers, instantaneous, continuous flow, inline, or on-demand heaters are becoming more and more popular. These heaters heat the water as it flows through the device and do not retain any water internally.
The main advantages, and the reason for their popularity, are a continuous flow of hot water and energy savings. Since the tanks are located where the water is being used, the water is almost instantly hot, which saves water. On this site you will learn the benefits of tankless water heaters as well as the way they function. There are several diagrams that you can look at in order to better understand the way this system works, as well as detailed descriptions of the heating process. The site also features tips for selecting a tankless water heater and the points you should take into account before you purchase one. Also on the site is information on installation and maintenance that can optimize the tanks energy efficiency, as well as a list of tankless water heater manufactures. 
