The Professional Classic Series Power Vent Ultra Low NOx water heaters combine advanced features for enhanced efficiency and performance. Featuring an induced draft design with the Guardian FVIR System, these units ensure safe operation and reduced emissions. They support flexible venting options up to 100 feet, accommodating various installation needs. Available in 40 and 50 gallon capacities, they are equipped with an integrated self-diagnostic system control, thermostat, and gas valve for optimal control and reliability in residential settings.