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With the piping mentioned in the OP, I would estimate that the 0011 pump would be running at around 17-20' of head and 14-15 GPM. If 15 GPM would flow to the point where the pump was located by gravity, it would never see negative pressure. Unless the boiler was a ways up hill, I doubt it would flow that much.As mentioned above, negative pressure at the pump inlet is not good.