Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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It's normal for there to be air in the tank initialy. This should have been vented out by the plumber as part of the installation. If he didn't that could explain the problem. You can try letting the hot water run for several minutes until it stops spitting air. If that doesn't solve the problem then the source of the air could be from the water supply, possibly a failing holding tank. If your system has an aeration system (to elminate sulfur dioxide/rotten egg smell) that's another potential culprit. It may just be showing up in the the hot water due to how the system is configured.
Doesn't matter how slow or fast you do it. The only objective is to get rid of it.