Designed and equipped to accommodate shapes that cannot be handled in a round style pot. Volume capacity ranges are from 32 Cubic inches to 864 Cubic inches with temperature ranging from 150 to 550 degrees F. RWP-1 and RWP-2 use a bimetal thermostat and all others use a hydraulic thermostat. Most tanks are also available in 60-250 degrees F. operating temperature ranges for lower temperature waxes and glue.