The temperature at which the SF6 gas changes to liquid state depends on the pressure.
With higher pressure, the temperature increases. To avoid the liquefaction of SF6 gas.
The temperature of SF6 should be maintained above certain value. For atmospheric
pressure, SF6 gas starts liquefying at a temperature of about 10 ° C. Hence
thermostatically controlled heaters are provided, which maintain the gas temperature
above about 16 ° C in case of high pressure system.