An apparatus for reducing condensation on water lines has a sensor for measuring dew point of ambient air, a first inlet for receiving cold water, a second inlet for receiving hot water, and an outlet. Further, the apparatus has a manifold in fluid communication with the first inlet, the second inlet, and the outlet, a valve for controlling the flow of hot water from the second inlet into the manifold, and an actuator configured to adjust the valve. The apparatus has a controller coupled to the first sensor and the actuator for controlling the actuator to adjust a quantity of hot water that is mixed with cold water at the outlet based on one or more dew point measurements from the sensor.