6-year limited Tank warranty, 6-year parts warranty for Residential applications Direct Vent Design- • One-pipe, dual-channel closed system draws all make-up air from outside the home, eliminating problems caused by insufficient indoor ventilation and is FVIR compliant. Horizontal air intake and venting on all models up to 80 inches from outside wall with no electrical power needed. Intelligent Control Logic - The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance. Green Choice® Gas Burner -Patented eco-friendly burner design reduces NOx emissions by up to 33% and complies with Low-NOx emission requirements of less than 40 ng/J. Coregard™ Anode Rod - • Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods. Blue Diamond® Glass Coating - Provides superior corrosion resistance compared to industry standard glass lining.