Tankless water heaters can go by many names. These names are combi boilers, instantaneous, flash, on-demand, or instant-on water heaters. These types of heaters are becoming increasingly more popular due to their instantaneous heating abilities. Rather than storing water, these heaters heat the water as it flows through the
device. They also don’t retain any water internally.
Tankless water heaters have become far more efficient than normal storage tank water heaters. Since they do not store water, they never heat the same water more than once. Other benefits include: