The AMRe ECM technology heating circulator from AquaMotion features all-metal construction, with a stainless steel replaceable cartridge with IRON GUARD. Its efficient circulator with permanent magnet rotor uses only 45 watts with a high-performance 18 gpm. The Iron Guard Design protects against black iron oxide and contaminants. An iron filter is not required. It offers fully automatic operation, with no programming, no buttons to push, and no speed setting, with an LED light and watt display, 10-foot detachable line cord and cord connector, flange with nut capture, and a built-in check valve. 401-785-3000; www.aquamotionhvac.com.