Have been attempted with candles to keep the tomato plants in the greenhouse from frost, but inadequately managed. This device with thermostat is no longer a problem because the heating power of 500W is far higher than that of the candle, with 40-100W. And thanks to the thermostat which now goes to and off automatically. In addition, the device is made in Italy and not in the Far East. The price is therefore fully OK I am fully satisfied.