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The existing cut out for a 6 gal Atwood water heater measures 16 1/4” (W) by 12 5/8” (H). The cut out needed for your GSWH-1 is only 12 ¾” by 12 ¾” and its flange MUST be supported on all sides by a wooden frame so that it may be mounted rigidly with #8 ¾”...
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Suburban unit measures 16 ¼” by 16 ¼ “. The cut out needed for your GSWH-1 is only 12 ¾” by 12 ¾” and its flange MUST be supported on all sides by a wooden frame so that it may be mounted rigidly with #8 ¾” flat head screws.