A lot of bad reviews abouy experiences that I didn't have with mine. I built a stand out of tubing, with casters on it, to set mine on. This way I could roll it around in my 3000 sqft commercial build shop. I use a bigger (loud) 100,000 K torpedo diesel heater to warm the shop up initially. And run the Vevor 8K heater most of the day and well into the night. Best part is the battery I use to run it is recharged by a 100 watt solar panel outside. Sun tracking! Once my shop is warm enough tjat I can work in a t shirt, I turn off the noisey torpedo heater and the 8k diesel heater can maintain the shop comfortable enough when outside air is mid 40's F and above. It sips diesel compared to the torpedo. (Of Course) Trying to buy a second one so I can don't have to keep rolling it around in the shop. Handt to have it mounted on wheels so i can point it at the work area im at. The shop is very well insulated, so that helps it keep up. Plus my ceiling is 18' high so the exhaust fumes aren't a problem. The torpedo heater fumes are a much bigger Hazzard since it doesn't have a seperate heat chamber. I bought a smaller Bluetooth one to install in my RV when I get the time. I'll keep the propane heater the RV has, and build a flapper in the ductwork so I can choose how I want to heat the inside of the big coach. I guess it's build quality boils down to what day they were assembled in China between a good one and a bad. I like mine. Tried yo post a picture but the app isn't working tonight...