Crawler-type flexible ceramic electric heater: bendable to wrap around vessels/pipes or lay flat on large workpieces, fits any geometry. High working temperature, fast heating, high efficiency, no pollution, accurate automatic control, strong mechanics and hot insulation, large contact area, long life, easy install/maintain. Ideal for pre-weld preheating and post-weld stress relief of industrial parts and field jobs, replacing old inefficient flame/high-frequency methods.