ProLine specialty point-of-use electric water heaters from A. O. Smith Water Heaters include 2.5-, 4- and 6-gallon models. Each is equipped with a single low-watt density copper heating element and durable tamper-resistant brass drain valve. The 2.5- and 4-gallon models come with a standard 110/120-volt cord set with three-prong plug and wall-mounting bracket for easy installation. The 6-gallon model requires hard wiring. It has side-mounted plumbing and electrical connections, with optional top-mounted water connections for field conversion. They have a glass-coated tank and aluminum-anode rod for protection against corrosion. 800-527-1953; www.hotwater.com.