Energy efficiency. One of the most important factor to consider when selecting water heater is the manner in which it is effective in conserving the energy. Therefore, taking traditional water heaters and tankless water heaters, it is clear that the tankless is capable of using energy effectively unlike in the case of the traditional heater. This make the tankless to be more prefer unlike in the case with traditional one.
Hot water supply. Since traditional method o water heater has a tank, it is more convenient in case where power is off.