The specs on the new water heater are confusing me. The min/max inlet pressures are: 5.0" WC to 10.5" WC. However, the table for Gas Pipe Sizing lists 0.5" WC. If I look at the Universal Plumbing Code, they have this table, but there is also one for 3" and 6" WC (as well as 1, 2 and 5, PSI). I think my utility provides < 2 PSI inlet pressure and and 0.5" WC pressure drop, but I don't know how to reconcile that with a minimum inlet gas pressure of 5.0" WC. What am I missing?