Yes, a 'vessel' can be a container.
Which water are you speaking of? The water in a vessel, I presume? heat can go into the water, the vessel/container, the air around the vessel, and the structure holding the vessel, and the structures in the vicinity
Container
a vsessel that contains
Hollo container
Yes, have
Vessel
sailer of a light fast vessel
vessel, container, pot
holder, vessel, repository, receptacle
A jug is a serving vessel or container with a spout and a handle.