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It's easy to take the emotion out of this and view it objectively: whether it's due to inexperience or intentional (I'll never know which - but the key is neither is acceptable), I paid more than I should have. One large expansion tank would have been sufficient....and cheaper. Perhaps...

Understood, and you're correct - basically one should aim to design for equal pressure drop (friction) across the piping run both into and out of parallel hot water heaters. If you don't, you're setting yourself up for a lead/lag heater situation. If you look at my pic, the inlet side trunk...

The tank on the right could have been mounted above the inlet line, but not the one on the left due to the proximity of the hot water discharge line that can be seen behind the tank. Please explain what you mean by "balancing the system". Agreed re: one shut-off valve per heater.

Thx Phishfood - sure, it's a clean, neat installation, as would it have been with a single, large tank - and cheaper with a single, large tank to boot - that's my gripe here. Not sure why the plumber put two smaller tanks in on the common inlet line, but I have my suspicions - call me a...

photo attached.....I think

Hi all - newbie here. I think I got conned by the plumber yesterday. I have two 50 gal hot water heaters set up in parallel with a single 4.75 gal expansion tank in the common supply line, downstream from the shut-off valve. The tank failed at the nipple weld (horizontally mounted with no...