steam boiler
鑵 centers on a metal container for heating water or producing steam: a steam boiler. The meaning is specific to that industrial or cooking vessel.
鑵 combines 金 (metal) with 雚, which likely contributes the sound カン. The character was created to name a metal boiler or kettle.
The left side 金 is metal, and the right side 雚 looks like a complex container with a lid and spout. Picture a heavy metal boiler made of 金, shaped like the 雚 component.
For カン, imagine a metal can that works as a steam boiler: can -> カン, and the metal 金 side reinforces the container idea.