Stave cooler

A single-mounting stave cooler for use in a furnace, comprising:

• a cast iron stave body in which are cast but not bonded any liquid coolant steel piping wherein, such absence of bonding prevents cracks in the cast iron stave body from propagating through into the liquid coolant steel piping;
• a single protrusion and jacketing steel-to-steel welding collar with a proximal end embedded, or otherwise anchored into a backside of the cast iron stave body, and positioned to enable the stave cooler to hang and be entirely supported by a distal end passed from only inside and through a single gas-sealable penetration of a steel containment shell, and in which all external piping connections of the liquid coolant steel piping within are collected together as a single group and routed through and passing between the proximal and distal ends of the single steel-to-steel welding collar.