If you really hate the idea of a 14x14 hole, then look into the Suburban Nautilus IW60. Similar price and specs to the Girard, but only requires a 3.5" circular vent hole out the side. I have no performance review yet since I just cut the hole and installed yesterday. Online reviews for the Suburban are mixed, just like most other tankless water heaters. I couldn't fit a large square hole, so that's why I chose it.
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