Re: [APD] heaters

[Chris <ecwh73 at gmail_com>]

Post a pic?

On 20 February 2010 05:03, Stuart Halliday <stuart at mytriops_com> wrote:
> I believe Chris wrote this email section below:
>>
>> Myself, I switched to an inline heater. It seems to be much more
>> efficient.  The one I have has protection circuitry if it somehow is
>> run dry.  Its a little bulky, but doesn't really matter since it's not
>> in the tank.  No chance of cooking a plant either this way.
>
> There are three basic types on the market.
>
> One has mechanical parts and uses a bimetallic strip to open and close a
> circuit which feeds a coil heater and this type has in the past jammed shut
> causing the overheating problem.
>
> The second is the same as the first except it also have a second backup
> overheating circuit to protect the coil from getting too hot. Like for
> example if it is removed from the water whilst still switched on.
>
> The third uses electronics to sense temperature and as well as being a lot
> more accurate and reliable, it also uses a semiconductor device to open and
> close the heating element so in theory can never jam closed.
>
> Needless to say the third type is also more expensive.
>
> I build myself a 15W heater several years ago using just electronic parts as
> I couldn't find a decent small heater for a small aquarium. It was in truth
> more expensive than a basic 25W heater. But at least mine was tiny, accurate
> and couldn't overheat.
>
>
> --
> Stuart Halliday
> http://mytriops.com/
> 200 Million years in the making...
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