Pressure vessels with an enamel-coated inner surface transfer the heat from the heating fluid coming from a single heat source to the hygienic water prepared inside the enamelcoated body using built-in heat exchangers (coils), producing hot and hygienic water. In RUSH single-coil hot water heaters, the heating fluid is typically hot water from boilers or cascade systems. A closed circuit is created and circulation is provided by a pump. Thermostat inputs on the device allow for temperature control. Based on measurements from these inputs, flow is controlled by the pump. The inlet temperature and pump speed are adjusted according to the targeted heating time to ensure maximum efficiency. Higher temperatures can be achieved more quickly thanks to the backup electric heater input on the device.
