ECR International has introduced the Dunkirk Quantum 90-200 hot water boiler. The Quantum 90-200's efficiency is increased beyond 90% when used in low temperature systems, such as radiant systems. Features include: cast aluminum mono block heat exchanger, less than 1⁄2 psi pressure drop through the boiler, no need for expensive high head pumps, flexible piping options and no requirement for primary/secondary piping, factory-installed and wired probe-type low water cut-off, no flow switches, and it is available in 125, 150, 175 and 200 mbh sizes. ECR International. Circle 20.