Replacement hot water heater parts are available from manufacturer websites, such as Rheem.com and from websites that specialize in hot water heater parts, such as Waterheaterparts.com. Replacement water heater parts are also available from home improvement stores, such as Lowes.
Hot water heater parts can be found on auction websites, such as eBay. Replacement parts are commonly separated by brand name and whether the heater is gas or electric. Most websites and stores also sell tubing and valves to connect the water heater, as well as installation kits. Installation kits and tubing are commonly universal while parts such as pumps and thermostats are specific to certain models.