I thought you were planning on relying on a pump for circulation. If it's thermosiphoning you hope to utilize to heat the old water heater tank, I think the way you have things plumbed will not work. The open loop system of your totes might cause the water heater to drain out via the gutter pipe, and potentially air lock the system. (at very least, you need to connect the line from the water heater to the tote at the bottom with the outlet. Any air in the loop will prevent any chance of thermosiphoning. You might be able to make a large ball check valve from PVC fittings to prevent potential backflow of the gutter connection. Also for thermosiphoning, I'd fit a low pressure check valve before or after the collector to prevent reverse flow when the collector gets cold.
2 PSI is like 5 foot of water column. Any water in the system over 5 feet above the nipples will over-pressurize them.
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