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The heater has proven itself excellent, heats up to 60 degrees in 1.5 hours at room temperature. Link to carbon fiber: https://a.aliexpress.com/_AMey2A How to calculate power: Voltage ÷ resistance = electrical power 12K = 33 Ohm / meter For example: 220 V (10 meters * 33 Ohm) = 150 W, (15 meters * 33 Ohm) = 100 W. Therefore, the longer the length, the lower the power, the lower the temperature.