The Greentherm 9000 Series from Bosch Thermotechnology is available in nine models for high-efficiency domestic hot water in residential or commercial applications with features for easy installation, operation and maintenance. It has a Uniform Energy Factor of 0.97 with Thermal Efficiency of 100 percent. This series achieves temperature stability of plus or minus 2 degrees F through the active bypass. Its advanced technology controls output capacity, optimizing comfort and efficiency by combining the burner’s pulsating mode with the bypass valve to achieve the desired outlet temperature, even at low flow rates. Its wide operating range between 9,000 and 199,000 Btu, saves energy when hot water demand is low. 800-283-3787; www.boschheatingandcooling.com.