I was planning on hooking the OWB I am buying into the furnace directly with no heat exchanger. Is this a good way to do it? I was talking with someone and he said to find out if doing it this way would corrode my oil furnace. Can you successfully run a system like this? Does water treatment become a bigger issue so I will not rust my furnace? Any thoughts? My OWB will be considerably higher than my existing furnace. I ordered a Shaver 165 model.