There shouldn't be any humidity unless you have a leaky system. It operates as a closed system and just recirculates whenever the thermostat tells it to do so. There is no incoming water to the water heater so there's no pressure in the system except some when the pump circulates the water. This works great in a greenhouse because you can keep the air temperature low but keep the bench the plants are sitting on nice and warm. It is actually more economical than heating the entire greenhouse.

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