I have played with this idea a little bit...an aquarium heater won't get the water much warmer than say 90 degrees. My tap water at home is about 130-135 degrees. Our pain threshold is somewhere 135-140 degrees. So, with that being said I put hot 130+ degree water in my Mist King reservoir and turned it on. Water was STILL cool to the touch, or at least my touch. I don't think there is much reason to use an aquarium heater, but this is my own little experiment. Possibly if you used 160 degree water, it would increase the mist temp enough that chameleons wouldn't go for cover, these higher water temps MIGHT inhibit algae/bacteria growth also.....