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Steve,
Normally 3/4" is ok but I try to get it change it to 1" gas line just to be sure, depending how far away are you from the meter. Not having enough gas to the unit is the one mistake most plumbers make because many of them have not had a lot of experience with tankless heaters. They are use to insallation regular heaters. How are you doing with development? Are you still building and keeping busy?
Jeff
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