TWZMYJP wrote:
I'm fearful that this may be an oversite by the factory...
Is this a new unit that you bought from a dealer? If so, I'd contact them to find out where the FW drain is in that unit. If they don't know, have them contact the manufacturer to find out. If it's an oversite, and you recently purchased it new, they should fix the issue for you.
I know some have suggested putting antifreeze in there (which I would not want to do anyway). In your case, however, it's especially problematic, as you'd never be able to get it fully drained and clean because you can't fully empty your tank. I'd hate to have residual antifreeze in there all season long.
If at all possible, I'd get to the dealer and try to locate the solution.