Stupid Evaporation Question

This question is stupid and I think I have the answer for myself but i'm curious on what your thought on it is.
Why does the light in an aquarium evaporate water and salt and the heater which is submerged in the water does not evaporate any of the water or salt even tho it reach's crazy temperatures.
Is it because the heater is submerged in the water ?

 

water can only evaporate from its surface. heat increases the evaporation rate, so technically your heater does increase the evaporation rate of the water its just a minimal amount as opposed to lights which are directly heating surface where evaporation occurs

 

water has to be exposed to air (atmosphere) before it can become part of it. the air has to be dry before it can absorb the water (vapor). the lights heats (dries) the air. the salt stays behind, which is why you have to add fresh ro/di water.

 

in addition, a fan blowing air across an open top tank will evaporate more water, also known as evaporative cooling, an effective way to keep tank temp down in the summer, but you will need more top off water.

 

the only way your heater would evaporate the water it comes in direct contact with is if it increased the thermal energy of the water molecules so much that they overcome the pressure of the atmosphere+water and turned to steam... (boiling) lmao