No water heater flue draft hood/diverter.

[Jerry Simon]

I'm pretty sure this has been covered at least twice before, but the mind is going.

No draft inducer, no draft hood/diverter.  Might this perhaps be kosher?

[Bill Kibbel]

If it's got a collar on top to clamp a pipe directly, it's probably intended to be a direct exhaust/direct vent installation.  If it's set up as an atmospheric vent system, that's probably the wrong model WH.