A steam exchange humidifier comprising a heat exchanger inside a tank, the tank comprising a drain and fluid inlet port for fluid in and out of the tank and a steam outlet; the heat exchanger comprising a heat exchanger array, a steam collector, a condensate collector, a steam supply port and condensate return port; the steam collector being connected to the steam supply port, and the condensate collector being connected to the condensate return port; the steam collector and the condensate collector being connected by the heat exchanger array, wherein the tank is a generally vertical body.
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