> From: "Peter Mudde" <[EMAIL PROTECTED]>
> Date: Fri, 23 Mar 2001 19:19:13 -0500
>
> Bimetal-thermostats have a tendency to burn through at a certain age. It may
> take a few years, ten years or more, but eventually, the two pieces of metal
> will be molten into eachother and it doesn't work anymorelike it should.
> Just to be on the safe side, use two thermostats. the second reacting to
> heath a grade or two over the first. (Thanks to Ron Kivit NL for this tip..
> and old one, but still relevant)
It's true that this is the usual failure mode of old aquarium heaters.
For a few dollars more you can buy ones with electronic thermostats,
which have no moving parts. I think that when these fail, they fail
'safe', i.e. off rather than on like the bimetallic strip types.
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