Tired of running out of hot water? That’s not a problem with one of these compact, ultra-efficient units that heat water as you need it. Tankless water heaters are quickly gaining popularity for many reasons. They save space, energy and fuel costs AND you never have to be the person who showers last in the cold. Your hot water will never run out! With tankless, because water is heated quickly and only when it’s needed, it’s more energy-efficient.