What is an electric tankless water heater ?
Answers:
It is an instant recharge heater. It heats water immediately so there is no need to store it in a tank.
Other answers:
electric heater rod to be dipped in bucket of water to make the water hot.
electric heater rod to be dipped in bucket of water to make the water hot.
It is a device that heats the water as it passes through it elimating the need for a large vessel to store the water in.
Not very effective for whole house applications (they require a large amount of power to perform this task), but very effective in situations where you need to supply hot to a single fixture.
Actually tankless on-demand water heaters are quite energy efficient, as there is no loss of heat from storing hot water in a convnetional tank. They do draw a lot of energy (electricty, gas, or propane) when they are being used, but so does a tank-style water heater. The tankless water heater will use less energy becuase there is no thermal loss in the tank, but if you need a lot of volume of hot water, like for a family all having a shower in the morning, the tankless water heater can't keep up.