Re: Aquatic Plants Digest V1 #59

>	Re: Roof de-icing cables
>I was thinking of something:  They state "not to use in conditions
>over 0 Celsius"?  This may mean the cables rely on the surrounding
>environment to cool them (the insulation can't handle higher
>temperatures, like operation at room temperatures which would
>raise the temperature of the insulation above a certain level).
>Because they are intended to be used only in colder temperatures
>to melt ice, it may assume a low level of heat before the
>insulation breaks down.
The fact that they are submerged should provide a much better 
heat exchange than if they were in open air.  I think that 
this would probably more than negate the overheating problem
at aquarium temperatures.