The heater temperature is maintained by an internal, automatic thermostat that allows for the heater to get to temperature quickly but will not allow the heater to go above 145°C (~300°F). Bending a schedule 40 PVC 1/2 inch pipe at a 90° angle can be accomplished in as little as 3 to 4 minutes! Bending a 4 inch diameter, schedule 80 PVC pipe can be done with the largest of the heaters in as little as 12 minutes! The unique circuit design and the way the heater is constructed ensure controlled, even heating for uniform bending time after time. The use of heavy duty materials; including t-stat, power cord, velcro® strap, and fiberglass re-enforced silicone rubber; allow for long service life in the field.