COMPASS H high-efficiency wet rotor circulators from Armstrong Fluid Technology have advanced Design Envelope variable-speed technology. Their Quadratic Sensorless flow control algorithm intelligently responds to system demand to consistently provide only the necessary flow, a feature that can help the homeowner save up to 70 percent in energy compared to traditional circulators. They offer a broad operating range of up to 20 feet of head and up to 20 gpm flow. They accept 0-10 volt DC external control and communicate with most modern boilers for improved boiler efficiency. They include nine different modes of operation, including auto. The performance range covers a wide range of fixed-speed circulators. They include a large wiring chamber and front-mounted terminal block. They comply with EEI<0.22. 800/356-9845; www.armstrongfluidtechnology.com.
