I think what this boils down to is M1307.1 General: Installation of appliances should conform tothe conditions of their listing and label and the manufacturer's installation instructions. The manufacturer's operating and installation instructions shall remain attached to the appliance. (bold mine)

Since these are new construction, you stand a chance of having them handy. Snatch a set, take them down stairs and read them. You'll know if what you're looking at is right or wrong.

Matt, could you have gotten the code idea from M1307,2 where water heaters in seismic zones are discussed?

Melborne, great town.

Thom

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The only reason some people get lost in thought is because it's unfamiliar territory.
- Paul Fix