I needed to humidify the space where I grow mushrooms. This is a low-budget, fuss-free humidifier. Unlike commercial humidifiers, it does not require purified water. It works by heating water relative to the environment. Power can be controlled by plugging the cord into a variac or other transformer.
The plywood circle did not have sufficient buoyancy, so I glued some foam on top. The slot in the stainless tube accommodates the appendage on the cup heater to make it stay put.
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