Us Brits just fitted 'Water Boiling Vessels' into all our armoured vehicles to keep a never-ending supply of tea going. (NATO Standard, of course - milky* and sweet)
Officially, it's not a tea kettle, but it totally is. Because they were fitted after the Bigwigs found out lots of tank crews were getting killed in WW2, because they were getting out of their tanks during lulls in the fighting to brew up, and getting spotted by snipers. Can't get shot by a sniper if you don't have to get out the tank to brew up.
As a side bit of trivia, it means the AFV crews rarely need to run guard duty on exercises, as long as they give the Infantry access to the WBV at night!
*Note, this may or may not be actual 'milk', just ask Holly.