Good day, folks. Our water heater, apparently original, is starting to rust. It works fine, no crud in the system, but the outer cover is in tough shape. Here's the problem: The lazarette opening is 13 3/4" and the heater is just over 14" in diameter. Other than employing the 'bigger hammer' method, how does this thing come outta the space? It is installed in such a way that the labeling is not visible so I'm unsure of the make/model. It's cylindrical, grey and heats by exchange and electric, 16" tall. Open to any/all suggestions on removal method AND a replacement unit in the 4-6 gallon range.