We ordered 3 Smart heaters in both 500W and 10,000 configuration and have found them to be easy to install and use, however, there is one circumstance that gives us some grave concerns. We are taken aback by how hot the walls get directly above the hot air outlets. I understand that paper doesn't combust until it reaches approximately 450 degrees, but the temperatures of the drywall directly above the heating outlets is a concern, and so much so that I purchased self-adhesive thermal barrier material to provide protection to 2500 degrees above each of the units. They were making the drywall so hot that those areas were beginning to ripple somewhat from the heat. EHeat can say whatever they like about how safe it is but when you feel how hot the walls are it definitely makes you stop and take notice. It's better to be safe than sorry.