Hey Lance, Sorry for the delay.
A bit of background:
They run the small coal water heater in warm weather.
The coal stove runs in cold weather. It is the only domestic heat. The silvery tin looking duct stuff around the stove increases air flow and makes the home more evenly heated. That silly thing really get the air moving!
Need that Magic Part thing. Bleeder? Proper name escapes me now. Long day.
Without it, pretty much it ain't gonna work very reliably.
Need lots of safety valves.
Need lots of valves to switch between 'furnace' and the summer 'water heater'.
Need valves with removable handles so grandchildren don't shut off something that causes a serious issue. Again.
Need a plan to take care of the T&P valve, because it WILL Pop-Off a few times before you get the logistics worked out. Hence the CU pipe on the floor going to the floor drain.
Need lots of safety valves.
Pay attention to how level everything is.
I don't show all of them, but Need lots of safety valves.
This area like to use NG water heaters as storage tanks because they have more water ports. I don't quite get it, but thats what they use.
This particular system puts a pipe on the chimney on the NG water heater and gravity feeds warm air to the bathroom. It is removed for summer and the water heater's chimney is stuffed with a few handfuls of fiberglass insulation.
(all my idea, BTW. It may be the only one like that)
I REALLY hate cold showers.
Need lots of safety valves. In case I didn't mention that before.
At least 4 T&P valves in this thing. Maybe 6.
It is that serious!
Not sure how organized the pics will show (it says there are 11 though I can only find 10), but they are here,
http://s701.photobucket.com/albums/ww20/ghurd1/Pumpless%20Water%20Heater/
G-