Greg I see your point. So in that case the EGC will possibly be adaquate for bonding the gase line.
My original point was that we have inspectors who ask that the H & C plus the gas be bonded together "AT" the water heater. The purpose of the bonding of the H & C water pipes at the water heater is to maintain the continuity of the water piping system through the dielectric unions on the water heater.
The purpose of bonding the gas line is to establish a path for current flow shoud the piping be energized. Clearly 250.104(B) tells us how to bond the gas line and bonding it to the water pipes is not one of the places that it list. Since the water pipes at the water heater are probably more than 5 feet from the entry of the water service they don't qualify as the water pipe electrode.
