Römertopf Tea Light Oven the Hot Heinz, an Oven for many hot hours of warmth, light and cosiness The Hot Heinz can be operated with up to 7 tea lights. This tea light fireplace heats a room of up to 15 m2 by up to 3 °C. Depending on the quality of the tea lights, the heat output is up to 280 watts. With this tea light heater you can simultaneously moisten your room air and also scent it. It heats your room at over 200 °C (7 tea lights measured on the lid). Water basin for room humidification has a volume of 150 ml