The Rinnai hydronic air handler systems connect seamlessly to select Rinnai tankless water heaters to deliver efficient home heating and domestic hot water simultaneously in one complete system. The system saves energy, compared to traditional furnaces, when integrated with Rinnai’s highly efficient tankless water heaters, Rinnai states. The air handler can also be configured to work with AHRI-certified cooling solutions, including indoor cooling coils and outdoor condensing systems.