TANKLESS WATER HEATERS
With these systems there is no storage tank continuously maintaining hot water. A possible concern with this technology is that if the unit is not sized correctly there is a limit on the number of fixtures that can simultaneously use hot water. However, there is an endless supply of hot water and standby losses are eliminated.
Tankless water heaters can provide most homes with considerable energy savings. The up-front cost is higher than conventional storage water heaters, but in the long run it is an investment that will pay off through monthly energy savings.