I have 2 50gallon hot water heaters piped in parallel for a 6unit apartment building. A few days before Christmas I replaced one of them because it was leaking, but not the other. (mistake number 1). The new hot water heater is now several inches higher than the older one.

Doing some "pipe-grabbing" while a hot faucet is on, it looks like the new one is being used a little more than the old one although both are running. I tried closing the ball valve on the output of the new one just a little to create some restriction so I can balance the two water heaters out. Any drawbacks to this??

I do plan on replacing the older one as soon as I get a chance.