Thanks for the hint, Mikesolar.
Fact is, the high efficiency part of the GeeEee heater is not defined by me, but their classification makes it qualify for our local natural gas company energy rebate (which I got) I know they aren't that "efficient" but compared to my previous 6yr warranty A.O Smith "skinny", this thing does save me some $$.
It could also be a myth or some kind but the local installers and market do not carry/sell any power-vent type hot water storage heater (none that I've seen so far, but crossing the border down-south..I've seen some). That would raise the efficiency a few more points.
Lastly: I did experienced backdrafting shortly after replacing the A.O Smith skinny with GeeEee....(both water heater tank and radiant boiler shares the same rooftop exhaust to the outside)...and that was attributed to less standby heating loss (smaller pilot light?) to that of AO smith skinny, for there's absolutely no change on the radiant floor boiler side.
Q.
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