Tankless water heaters are also known as combi boilers, instantaneous, inline, flash, on-demand or instant-on water heaters. This type of heater is rapidly gaining in popularity. Rather than storing water, these heaters heat the water as it flows through the device. They do not retain any water internally.
Tankless water heaters can be broken down into two categories, “full on/full off” and “modulated.” Full on/full off units do not change the power output at all. The unit is either on or off. Modulated tankless water heaters vary the heat output based on the flow of water running through the unit.
Tankless water heaters can be far more efficient than storage tank water heaters. Because they do not store water, they never heat the same water more than once.
Tankless water heaters are also becoming very popular in homes because they may qualify for an energy star rebate program from the federal government.
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