i need help to unclog the 400watt heater, my wife works in public school and i am a electrical contractor & i inherit lots of can you fix this, all lines are clear except the heater thank you

Try running distilled water through the unit or try using the following product...

http://www.americandj.com/product.asp?ProductIDNumber=892&cat=Fog_Juice

If neither of those work, the pump probably needs to be replaced.