Oh, and another issue I had with our water heater, before this present issue, happened last week. Just wondering if the two issues could be related.
Last week the plastic drain plug failed. I came outside and found water leaking from around the drain plug. The head of the plastic plug was loose from the base of the plug and easily broke off leaving the threaded portion stuck in the water heater drain hole threads. Of course I lost most all of the water in the water heater during the removal of the old plug and installation of the new plug.
Could this speak to the need to follow the suggestion that I open a low point drain and re-establish the air chamber in the heater?