Combined horizontal and vertical vent runs up to 120 ft (using 3 in vent pipe). Powerful modular blower with 110/120 V electrical system, 7 ft cord, 3-prong male connector. Advanced Intelli-Vent™ gas control valve, with premium-grade silicon nitride hot surface igniter. Glass-lined tank with anode rod protects against corrosion. Eco-friendly Green Choice gas burner reduces NOx emissions 33% over standard burners. Factory-installed Temperature and Pressure Relief Valve. 6 years tank and parts limited warranty.