The T400U is a wall-mounted ceramic convection heater from ECO-heater. It comes with a digital thermostat for temperature control between 32 to 99 degrees. It uses fan-less “silent-flow” technology that consumes 70 percent less electricity. The heater is mounted with a ¾” space between itself and the wall. This creates a convection heat channel where the hot air in the gap behind the heater rises up, drawing in cooler air from the floor below. In case you’re wondering about the impact of the heat on the wall, the T400U comes with a heat reflector that shields the wall. With the help of this air circulation system, you can save up to 50 percent on your heating costs. This makes the T400U far more economical and environment-friendly than other heaters in its class.