I was told years ago not to transport water heaters horizontally because
their long internal Magnesium anode rods are fragile suspended out
supported only by one end.
In the real world, I've transported 8 or 10 new ones horizontally
through the years, but have always been extra careful of road bumps, and
to not to mechanically 'shock' the heater while on it's side.
If you do break a rod, you won't have any way of knowing, and it won't
'rear' it's ugly head till the tank rusts through pre-maturely...
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