[LazyPup]

In regard to your question about corrosion,,Depending upon the humidity conditions in the crawlspace you may see some premature rusting of the outer skin of the water heat, which is also often seen when water heaters are installed in garages, basements, attics or unheated utility rooms. Aside from being a bit unsightly, that light rusting on the outer skin will have no adverse effect on the opeartion or longevity of the waterheater.