1. Ideal hot water delivery for households with 3-4 people when sized appropriately. 2. Environmentally friendly 40,000 BTU Low NOx gas burner delivers 67 gallons in the first hour. 3. Electronic gas valve provides precise temperature control for optimum hot water delivery. 4. Self-diagnostic electronic gas control incorporates an LED status indicator that monitors and reports on system operational status. 5. Built-in safety system reduces the risk of accidental flammable vapor ignitions. 6. Short 51.5-in H x 22-in diameter design is ideal for condensed spaces like under staircases and closet installations. 7. Protective anode rod and fused ceramic tank shield provide superior tank protection and extend water heater life. 8. High-altitude certified from 0 ft to 10,100 ft 6-year limited residential warranty gives you peace of mind.