75 Gal. natural gas tall water heater comes with a 75,100 BTU/hour environmentally friendly ultra-low Nox burner. Rheem ultra-lox Nox models meet all the highest environmental standards-reducing Nox emissions by 65% over standard gas water heaters. The electronic ignition system eliminates the standing pilot light, saves energy and monitors system Performance. A premium grade anode rod provides long-lasting tank protection. Factory installed temperature and pressure relief valve and 1 in. water connections are included with the water heater for easy installation.