As of February 2015, used water heaters can be purchased online in used condition through retailers, such as Amazon.com, and resale and auction sites, such as eBay. However, inventory on auction and resale sites changes frequently.
There are also auction and resale sites devoted to used machinery and equipment, such as Bid-on-equipment.com. While inventory does change daily, many used water heaters can be purchased from this site, including brands such as Kenmore, Columbia and Parker. Water heaters can be purchased by going to the Bid On Equipment site or by calling their customer service number at 847-854-8577. Consumers can also sell their used equipment via resale sites.