They cylinders will be accessible, its just height thats an issue.
I think the easiest way would be to have the water through both cylinders. It would save having to balance the cylinders.
So it would be, cold feed to first cylinder, hot to cold feed of second, then out. Obviously one cylinder will have more work to do than the other. But this should give good hot water till I get near the end of the tank. The reheat is true, but it will only take 10 minutes to draw off all of the water. So it won't reheat all that much I wouldn't think.
I think the easiest way would be to have the water through both cylinders. It would save having to balance the cylinders.
So it would be, cold feed to first cylinder, hot to cold feed of second, then out. Obviously one cylinder will have more work to do than the other. But this should give good hot water till I get near the end of the tank. The reheat is true, but it will only take 10 minutes to draw off all of the water. So it won't reheat all that much I wouldn't think.