The Electromantle Extraction Heater-Stirrers offer a choice of three or six recesses. Individual built-in solid-state electronic controls enable easy regulation of each heater, while removing sparking associated with mechanical switching. These models incorporate a stirring module that allows the solution to be stirred and heated at the same time. There is one stirring control for each set of three recesses. Stirring speed range is 50 - 1000 rpm. Units include three 0.5"(12.7mm) diameter support rods. External surfaces are PTFE-coated and resistant to most chemical solutions. The robust construction permits continuous operation of the units as required by routine extraction tests. Element temperature range to 450°C. The coiled heating element is suspended within a thermal insulating cartridge to provide maximum heat transfer and support while removing sparking associated with mechanical switching. Heater cartridge can readily be replaced when necessary. For additional operator protection a safety earth (ground) screen encloses the heaters. Unique airflow ensures unit is safe to the touch. Pilot lights indicate when power is on, supplied to heaters. 115 VAC (230V is available). Shipping weight: 16 Lbs (E1511-4 / -5 are 22 Lbs).