Thanks Greg. The manual looks like it could use a general overhaul, a lot of apparent corrections and updates put in it over the years and being stuck in there at various places is pretty obvious. Its not the easiest read for a manual in my experience.
I will probably leave my stove as is. I ended up hauling water to fill it initially and also haul water and fill it with a nurse tank I built to keep it topped off, so not much chance of anything getting in it since I use municipal water and transfer it between two different containers before it goes into the stove (the 5-gal container I haul fill water in and then the 15-gal nurse tank that pumps it into the boiler. I just hope I don't have alot of the manufacturing gunk that some of the other posts on this site show! I have circulated enough now, I think I would have sucked something in there by now if it was going to happen.
I wonder how much stratification happens in the stove since I run my pumps 24/7 and things are continually circulating. My heat well for the Ranco is in the upper part of the tank and when it is pulling heat out at the house and/or shop, dumping the cooler water in the top, the temp in the top is lower than the thermometers I have where water leaves the boiler at the bottom. Since the cold water should sink when it enters the boiler, doesn't it have to pass by the heating chamber and would gain the heat back when passing thru? it also dumps in at the back and pulls water out from the front of the boiler, so also has to pass thru the length of the tank too. What do you think about that theory?