A tank and tankless water heaters, or demand is one that warms the cool water as it passes through, instead of creating and storing hot water early. It is designed to take up less space and consume less power than traditional water heaters tank. These water heaters provide a constant flow of hot water, compared to the limited supply obtained from a tank.
The idea of tankless water heaters seems almost too good to pass up. Imagine a hot water heater that heats water on demand so you never run out of hot water, no matter how many people need to shower. And that is not a tank means no energy wasted in repeatedly heating a 50 gallon tank of water that can be used for many hours at a time.
There is only one problem with all this if you are planning to install electric tankless water heaters. In order to heat the water sufficiently quickly enough, an electrical heater uses an excessive amount of electricity. In fact, an electric water heater tankless uses more electricity than many newer homes are designed to provide whole house. Obviously either the solution is to install a water heater tankless gas or have authorized to make the necessary steps to provide adequate power for electric heater changes electrician.