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The principle of the "WARM heater"is the convection heat transfer.
Air flows in heater through the bottom of the inner layer.With the
heating of candle,air heats up,and the hot air rises. With the increase
of pressure, hot air flows throughthe bottom of inner layer,then rises
again.The air flow is formed .The hot air rushes out from the middle
of outer layer.This process achieves a heat exchange with outside.
WARM heater has high utilization and solves the heat problem much
more effectively than stove.