Originally Posted by

**Meep**
The bigger question is how often do you want to empty it? Or can you drain it right into a floor drain and thus avoid constant empyting?

I have one that is about 30 pint capacity in my basement (100+ year old farm house rock wall basement, so not exactly as dry as modern basements) and during humid weather it can fill up every day, and I don't currently have any tanks in the basement that is just natural moisture...

Evaporation is dependent on surface area, so you need to take the surface area of all your tanks and estimate about 5-6mm of evaporation a day and see how many pints of water you can expect those tanks to give off each day...

To put this in perspective, lets take a common 180g factory tank... Top dimensions are 72.5" x 18.5" or about 1341 square inches if we estimate about 0.25" of evaporation a day it comes out to about 335 cubic inches of water, or 1.45 gallons (11.6 pints) of evaporation a day... With that said if you had that single 180 gallon tank in your basement you could expect to empty a 30 pint dehumidifier every 2 days just for the tank evaporation, plus some extra depending on how much the ambient humidity is that could easily mean emptying it every day...