The tube-in-tube-type combination boiler/heat exchanger from Walker Process Equipment, A Div. of McNish Corp., is integrated with water piping, fuel lines, instrumentation and a complete electrical control system, including touch-screen technology. The dry-back, double-pass boiler with a forced-draft burner provides combustion efficiency and dependability. The exchanger has a biosolids/water counter-flow arrangement that provides heat transfer. The boiler maintains water temperature at 180 degrees F and ensures optimal boiler exhaust temperature as heat is transferred from the burner flame to the boiler water. The feedwater system automatically blends hot water with warm water on demand to maintain optimum heat transfer. 630/892-7921; www.walker-process.com.