ECR International has introduced the Dunkirk Quantum 90-200 hot water boiler. The Quantum 90-200 features efficiency increased beyond 90% when used in low temperature systems, such as radiant systems. Features include a 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; available in 125, 150, 175 and 200 mbh sizes, and combustible floor plate. ECR International.