Worth it to replace water heater on flip?

[Cooper B.]

My local power company will give me a free electric water heater if I switch over from gas. It will still cost me about $250-$300 for additional parts and for the electrician and plumber to hook it up.

The current gas water heater works, but is 8 or 9 years old. I'm wondering if anyone has any insight on if it is worth the time and expense to replace a working heater with one that is brand NEW.

The house is about $250k ARV, and will have new roof, windows, cabinets, bathrooms, in case that makes a difference.