don't forget to 'jump' the metallic hot and cold water lines
While this is never a bad thing to do there is no specific requirement in the NEC to do so.
The metal water piping systems are required to be bonded however there is no reason that must happen at the water heater or that a bonding conductor must be installed.
The hot and cold water pipes are very likely to already be bonded together at tub and shower valves, laundry valves, mixing valves at the boiler etc.
If we say those are not reliable connections we might as well put a bonding jumper around every soldered connection.
For what it's worth here is the 2002 Handbook commentary.
If it cannot reasonably be concluded that the hot and cold water pipes are reliably interconnected, an electrical bonding jumper is required to ensure that this connection is made. Some judgment must be exercised for each installation. The special installation requirements provided in 250.64(A), (B), and (E) also apply to the water piping bonding jumper.
Hey John I am not picking on you here, this is just a pet peeve of mine when I see inspectors say the hot and cold must
be bonded at the water heater.