【ONE YEAR WARRANTY】******Note: 【Once you buy the kit, suggest you change all the parts. Someone just change thermostat but heating element. The old heating element could cause long time heating and waste electric etc. 】 ******The Z tune-up kit helps you renew or repair an electric water heater system as it comes with a complete set of thermostats and heating elements.********** Contains all the parts needed to repair or renew an electric water heater. ***Fits most brands including American, AO Smith, Bradford White, Craftmaster, General Electric, GS Wood, Kenmore, Lochinvar, Maytag, Mor-Flo, Reliance, Sears, State and Whirlpool water heaters, Replace for Rheem SP20060, Eastman 60178 etc. common kits.【fits tank bigger than 30 gal and larger than 14" insider diameter】 ****【IMPORTANT NOTICE WHEN REPLACE THERMOSTAT】Make sure the new thermostat fits tightly against the tank. You should NOT be able to slip a business card between the thermostat and the tank. If you can, bend the thermostat mounting clip until the thermostat fits tightly against the tank