I always wondered if it was a big deal that my hot water heater was apparently plumbed backwards. The cold water entered into the HOT nipple. I just moved the unit and while replumbing it I took the liberty of correcting the apparent mistake.
Haha. Now I think it truly is backwards and perhaps the original plumber swapped the dip tube so it matched the existing pipes better.
When I run some hot water in the house, I can hear the new cold water "percolating" in. I can hear it apparently running in and splashing into the top of the water column. As I understand it, it should enter through the dip tube to the bottom. I do not recall hearing this before. At first I wrote it off to not being completely bled of air but now I'm wondering.
Would that sound indicate that it's now backwards? I guess I can either replumb it -PITA - or switch the dip tube back to the marked COLD side. Is it a simple task to switch the tube? It is a John Wood (GSW) heater - made in Canada I do believe.