That will not help in this situation. Remember that the system will only move the water when it gets hot enough to rise. It needs the time to heat up so it becomes more buoyant. That is what will start the circulation, and the hotter the water delivered to the top of the tank the faster the flow. It is a self limiting system. Your coil is fine. It also needs to have very little resistance from bottom to top so a center blockage may be counter productive.
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