Combined fuel flues help

[Rick K. Kie]

1.Can you combine an oil fired boiler and a natural gas water heater into the same flue?
I also would like code references if you have them.
2. Is oil a solid fuel?

[Brian E. Kelly]

Oil gas can vent to same chimney 03 irc 2427.5.6.2 ..................03 nfpa 211 9.8.3

no common connection with solid fuel chimney 03 irc 1801.12 ...........................03 nfpa 9.7.12

Oil might be a solid fuel when it is frozen Ricky, wood, coal, and Uranium are solid fuels.

[Rick K. Kie]

Thanks for the help I will look these up. I called it out wrong, its not something we see everyday