I purchased this product (model HF-0020T) from a local seller for my office. I have to say this is the best I've ever had. We have regulations in the office (government) that require the heater to have roll over and thermal protection. The security experts tested it and it passed! I don't know how long it will last, but it works VERY well. It was a bit difficult to get the desired temperature with the thermostat. However, now it adjusts my range within 1 degree. While I'm not sure why others are having issues, I suspect they simply received a defective product. Of course it turns off and on again, but that's because of the thermostat, so maybe their thermostat is bad. I can turn mine all the way on and it just keeps working. It's 72 in my office right now and the heating is working as I would expect to keep the temperature high. Great product again. You will be satisfied with this item!
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