On Mar 18, 11:45*pm, Don Ocean wrote:
ransley wrote:
On Mar 18, 4:46 am, Don Wiss wrote:
On Mon, 17 Mar 2008, Donna Ohl wrote:
I challenge you to find a water heater efficiency rating NOT in this
36-page listing for a water heater currently sold in the USA.
http://tinyurl.com/38eh4d
(long url)
http://www.gamanet.org/gama/inforeso...ntLaunch/C2AAF....
Where's the A.O. Smith Vertex model GPHE-50 that Bubba recommended?

Don www.donwiss.com (e-mail link at home page bottom).

I saw one unit near the bottom with an Energy Factor of 70, only a few
in the 60s and most in the 50-60 range. Vertex, I have a several year
old similar AO condensing ccommercial unit but I only know its 92%
efficent or so

I am aware of no water heater approaching 92% efficiency. Way too many
losses to achieve that.. Even Boiler technology can't do that yet

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92-93-94 even 98% water heaters are common even 96% boilers, even a
94% tankless. AO Smith Cyclone tank, Takagi tankless and a Canadian
firm makes a 98% commercial hw boiler, 5 years ago I installed at my
apt a 92% 1900000 btu AO Smith Cyclone. these are all condensing
units,