Designed for plumbing systems without a recirculation line, the ecocirc wireless instant hot water system from Bell & Gossett, a Xylem brand, uses electronically communicated motor technology to operate using as little as 20 watts of power. Installed under the sink, the system’s battery-operated paired valve, equipped with an onboard temperature sensor and wireless RF transceiver, communicates with the circulator pump mounted to the water heater or hot-water source to deliver temperature-controlled hot water.