Convection current will likely take effect to bring the system to equilibrium when the water gets heated.
In this problem, we are provided with a system of water a container and a heater. Now when water is heater it molecules are displaced going by the theory of particulate nature of matter, the water molecules move in a constant rapid random motion.
Description of the system
When the water molecules get heated they gain kinetic energy which makes them move away from one another as they also become lighter in weight they move from the bottom of the container to the top of the container, the molecules at the top are more dense, they move from the top the bottom of the container and the process continues till equilibrium in temperature is reached. This process is known as convection current
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