Sweating tank can cause moisture problems inside bathroom.
Sweating is caused when incoming water temperature is hotter or colder than air temperature inside bathroom.
You can verify this by not flushing tank for several hours and notice that sweating stops once water inside tank warms or cools to same temperature inside bathroom.
Problem can also be cause when there is not enough ventilation inside bathroom and water on tank does not evaporate.
To solve problem:
1) Increase bathroom ventilation and add dehumidifier or fan so condensation drys.
2) Insulate interior of tank. Empty water and let tank dry. Tape off moveable parts. Use can of spray foam and insulate inside of tank. Let foam dry and cut away excess foam.
3) Add tempering tank or staging tank inside room to pre-heat/cool water before it enters tank
http://waterheatertimer.org/Tempering-tank.html
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