Electrolux High Density Ring Heaters are manufactured using the same construction as our high density strip heater. Electrolux Ring Heaters are available in diameters ranging from 2 1/2\" to 11\" with inside diameters from 1/2\" to 8 1/2\". Ring Heaters have temperature ratings up to 1200°F (650°C). Ring Heaters have a wide variety of surface heating applications.