Energy Smart mode intelligently reacts to homeowner water use in order to reduce standby heat loss and save you money on your energy bills. Built-in leak detection and warning functionality alerts provide added peace of mind. Short 49.25-in H x 23-in diameter design is ideal for condensed spaces like under staircases and closet installations. Smart grid ready, connect via an optional CTA-2045 port adaptor and utility communication module. Premium heating elements, anode rod, self-cleaning dip tube and fused ceramic tank shield provide superior tank protection and extend water life.