PTC heater with ceramic shell. long life, high reliable. More information about this product, visit: tiancheng-ptc.com. PTC heater with ceramic shell.1. Surface temperature can be selected between 50~280. Rate voltage can be 6V~400V, AC or DC.2. The tolerance of surface temperature is ±7 usually.3. Put PTC in water, when check the power in water, and the temperature of water is 254. Customer ...