Online retailers that sell water heating elements include HomeDepot.com, AceHardware.com, Grainger.com and PlumbingSupply.com, as of 2016. Additional information on buying and replacing water heating elements is available at Water-Heater-Repair-Guide.com.
The Home Depot sells a wide range of water heater parts including elements, anode rods, fittings and installation kits. The website features heating elements manufactured by Rheem, Eastman and Camco.
Ace Hardware sells water heater repair parts from a number of manufactures including Campbell, Cash Acme, Reliance and Watts. Available parts include Reliance Lifelong elements, Reliance LP pilot assemblies and Sharkbite pressure regulating valves.
Grainger sells a wide variety of heating element types and styles including bare wire, flexible, bolt on and foldback. The elements range from 120-volt to 480-volt.