Where
The heat energy will only be delayed at the start. Energy will have to go into the wax/lava and make it rise. Some of that energy will be lost in the form of friction as the lava moves around. The rest of the energy is then released into the environment (heat) as the lava cools off and sinks down.
All of the energy that is put into the system would come back out in the form of heat.
The starting and ending conditions are the same (cold lava resting on the bottom) and as its not creating mass (destroying energy), what goes in as energy must come out as heat.
