Shopping for tankless water heater & see e.g. Rheem offers both power
vent and direct vent.

Appears the DV models require a 5" stainless coaxial vent pipe . . .
more expensive and more complicated.

Does not appear the PV requires the coaxial pipe . . . piping outside
air for combustion is optional. So, simpler and cheaper I think?

Downside of PV is use of electricity for blower (when it's running)?
How much can that be? Enough to make the added $$ for the expensive
coaxial stainless worth it?

I am in West-central Ohio with 47-53 degree ground water.

I can sweat copper and run black pipe for gas . . . is vent piping a
"novice beware" job in your opinion?

thx
JR in OH