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CO Alarm: Kidde Nighthawk vs. American Sensors

Over a year ago I purchsed a new Kidde Nighthawk Premium plug-in CO
detector (Model 900-0076 AC) for my house. Initially it seems to work
fine, but after several weeks it started giving single beep every hour
or so.

At first I thought the battery was dead so I replaced it with a new
one. It didn't help.

So, I called Kidde who, based on the error code on the LED display,
immediately sent me a new unit (didn't even ask for the defective one
to be returned).

Then the story repeated itself after several weeks. I called Kidde
again and again they sent me another new unit.

Then the story repeated itself after several weeks... At this point I
gave up on Kidde, realized that they have an inferior product marketed
cleverly and decided not to buy any CO detector for the home until I
find something that I am convinced works (I used to have the excellent
AIM http://tinyurl.com/nxfny but when its battery died before the 5
year warranty ended, I discovered that the company went out of
business).

So time went by (and we are still alive) and I discover that finally
there is some home for a better alternative: Model CO851 by American
Sensors.

http://www.smokesign.com/12plindiseco.html

The marketing for it says "Voted top alarm in the USA!!!" - and it sure
is priced higher than the Nighthawk - but before going ahead and
purchasing it, I am curious to know whether anyone here had experience
with it and if so, does it really live to its expectations?

I also just found the following interesting article:

http://www.avweb.com/news/aeromed/186016-1.html

and wondering again: Have I found the best carbon monoxide detector in
the market?

Thanks!
Sam
 
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