The Benchmark Platinum Condensing Boiler features dual return capability, that keeps cold water separate, creating a condensing zone that improves boiler efficiency up to 7 percent. Dual returns are for applications that feature combination systems including multi-zone space heating, space heating with domestic hot water radiant floor heating, snow melt, pool heating and more. The product also comes with onAER Remote Monitoring, which monitors the overall health of the system. onAER provides a site that offers an instant, intuitive, easy-to-read overview of a system including unit performance, plant efficiency, detailed technical data and more. AERCO.