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The warm water from your Keilini Portable Heater boiler flows through a radiator coil and an electric fan pushes air thru the radiator coil. The air coming into the coil absorbs the heat from the water, resulting in a warmer discharge air temperature. The cooler water leaving the coil returns back to the boiler to be reheated for every other pass via the radiator coil.https://www.healthmassive.com/keilini-portable-heater/