Ignoramus9393 wrote:

I bought a used water heater at an auction (at a defunct Grainger
warehouse). Model G91-200-1.

Here's a link to this model's description:

http://www.grainger.com/product/RHEE...r-Heater-6E743

OK, a couple observations. 590 Lbs dry weight plus 91 gal of
water weighs 1318 Lbs! Can your floor take this weight?
Second, can your flue take 199K BTU without
burning down the house? My water heater has a 3" flue connection,
I think. This thing needs a 6" flue, and it burns more gas than the
furnace on my 2600 sq. ft. house, which is 138K BTU, I think. Third, it
apparently needs electricity for the draft blower and safety controls, so
you get no hot water during a power failure.

Jon