Weller W100PG 100 Watt Controlled Output Soldering Iron uses the ”closed loop” method of controlling maximum tip temperature, the nominal heat-up time with 700 F tip is 110 seconds. The Weller W100PG 100 Watt Controlled Output Soldering Iron features a portable line voltage iron with no base station required and the stainless steel modular plug-in heater means greater efficiency & versatility.