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The dew heater I have, has structurally failed after a couple of weeks of very light usage. The plastic holding the two leads that connect with the heating elements, has torn and the elements are broken. This is light usage and I have made an effort to treat it gently. Just picking up the camera with the heater attached, causes a twisting of the plastic containing the heating elements.
This is an extremely weak point in the design, the only solution provided with the heater is a couple of plastic ties to hold the heater lead against the body of the camera. These interfere with the use of the plastic camera holder. This is a major design flaw and I have to rate it "F".
Right now I need a replacement because of very humid local weather. I will try to order one but ZWO needs to find something better!