Ceramic Heater Safety

I live in a small place without conventional central heating. I've tried a few space heaters. The oil filled radiator looking things take a lot of electric to run, they crack and creak as they heat up, but they work. Lately i've been using a quarts tube unit from lifesmart. It is the cats meow. It has a fan that is pretty quiet with different speeds and the quarts tubes last a long time. It has an eco mode that is set on 68 that I am using, depending on the temperature drop determines how many tubes light up and how fast the fan runs. Search at home depot or other stores will find them. Mine looks like a black box about 1.5' square and sits on the floor. It won't tip over and nothing gets hot that you can touch. Using these has been the comfortablist of any setup I have been using and the electric bill has so far been the cheapest. They are rated to 1500 watts when all the tubes are lit and fan on high but eco mode it might not use all the rated wattage.

Some of them have a filter on the back. This would be my choice to keep dust off the tubes.