Yes, you can vent it through the wall with a power vented water heater.

Here is a link that might be useful: Power Vented WH Installation

thanks for the help. Can it be vented out under a window?

This post was edited by econo on Tue, Feb 19, 13 at 7:03

no. There is a minimum clearance from windows, I forget how many feet.

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Here is a link that might be useful: Plumber Master

I think A1 Plumbing of Baltimore hires folks that either:
A) Can't read, or
B) Are thieves.

You don't get to attempt to steal advertising space on this site. By doing so, I have to assume you are incapable of reading the site TOU or that you don't care. Either way, were I in the Baltimore area, I would not hire a plumber who is either uneducated or dishonest.

You asked.