On the RAGBRAI bus, the 4" pvc pipe is its only water storage. The only thing in the bus that uses water is a shower. No Toilet. The two things I've always like about it was free heated water, and no water pump needed. It only gravity feeds to the shower. Someday if I ever get to it, I think I would run a line from the top pvc to the hot water heater and put a valve in to isolate from the water pump. That way your solar pipes are for hot water only, and if you need to add in some cooler water for say a shower, the pump could still add cooler water in at the same time. Also, I would like to valve it and be able to fill the top pvc pipes from the "city" fill. So you woudn't have to climb to the top of the bus everytime to fill the pipes.
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