Defender Safety System Energy Saver Hot Water Tanks (30, 40 and 50 Gallon models) Include: * Piezo Ingiter * Advanced ScreenLokTM * Technology Flame Arrestor Design * Resettable Thermal Switch * Pedestal Base * Maintenance Free Sight Window * 1" Non-CFC foam insulation (except where noted). * Vitraglas® lining. * Protective magnesium anode rod. * Factory installed dielectric waterway fittings. * Factory installed Hydrojet® Total Performance System. * T&P relief valve included. * "Snap-Lock" draft diverter. * Brass drain valve. * Fully automatic controls. * Flue Baffle