We were told by the gas company that we must have a ground on our gas lines to furnace and hot water heater, what do we do?

Wait for Mark, he knows about these things. This subject has come up before. These type of code changes are seldom retroactive.

Are all of the lines flexible throughout the house?

Are they flexible at only the appliances?

Hi all...

Answer Kiss' questions... OK?

Meanwhile, assuming that you have a corrugated stainless steel gas system you want to attach grounding clamps at the black iron pipe going into the furnace and the water heater. You could also attach the clamps to the brass flare fittings, but you CANNOT attach directly to the corrugated stainless steel pipe.

You'd use a minimum #6 AWG copper wire and run that back from both appliances to the grounding bar at the electrical panel.

You may also be required to install a ground wire downstream of the gas meter, but if it wasn't mentioned by the gas company I wouldn't worry at this point.

Finally, I present how we do this in my area. I would advise you to chat with the electrical inspector and double check exactly how he wants this done as each state has its own requirements. In my area, bonding/grounding requires a licensed electrician and a permit.

Any questions... let us know.. OK?

Mark