3rd floor unit hot water problems

[Walid Zaibak]

Hey guys, a week or so ago I had a small flood at a property of mine in the office above the utility room. A sink had improper pipes put in with no shutoffs. Water started seeping down into the utility room until I got there and turned it off. I got a plumber to fix everything. I also got an HVAC guy to come replace a part on the hot water tank that got wet and fried. Everything seems fine for my other tenants but this guy tells me that he cranks the water all the way to hot and it's barely warm. I know the heater temp is fine since I just set it and everyone else is fine. I'm really not sure what's going on. Any ideas on how to fix this issue?

Thanks,
Walid