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  1. #1
    pescude's Avatar
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    Default dew heater or a aquarium heater for $7



    i needed a dew heater for my 2080 meade. went to the pet store and bought a 7 watt aquarium heater for $7 and it works well.
    the 15 watt was to hot.
    pescude

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  3. #2
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    did you disassemble the heater or something or just set the aquarium heater in the scope tube?

    Details man, details.

    Did you use the thermostat with the heater? How did you force the heater to stay on?

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    Default

    Neat idea. Wish I'd thought of it before I bought my Kendrick. But if the Kendrick ever craps out, it's off to Petsmart for me..

    Quote Originally Posted by Happyfeet View Post
    did you disassemble the heater or something or just set the aquarium heater in the scope tube?

    Details man, details.

    Did you use the thermostat with the heater? How did you force the heater to stay on?
    I suspect that he didn't use the regular glass tube aquarium heaters that you may be thinking of. If you do a google search on "Hydor Mini Heater Aquarium Heater (7.5 watts)" you might get a better idea.

    I'm too new to post links, so you'll have to do the search yourself.
    Mike

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  6. #4
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    Yeah man I think you are right about the type of heater he was using, but I still wondered if the power supply was disassembled and he was just using the pad itself running 7.5 watts through it, or what.

    Also, where would this be mounted? Taped to the back of the primary? Wrapped around the secondary?

    After my mirrors fogging up last night and having to wipe my eyepieces to git rid of condensation I think I will have to do something cheap like this.

    My temporary fix to the problem was to take my mom's hairdryer outside and use that to warm everything up a few degrees.

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    He's using it on a Schmidt-Cassegrain, so I suspect he's attached it to the front ring to keep dew from forming on the corrector plate...at least that's where I wrap my Kendrick heater.

    Sounds like you might be using a newtonian, so maybe you could just stick it to the back of the primary to warm it up a couple of degrees? Not sure as it's been a few years since I owned my Meade 4500.
    Mike

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    Hmm I have a hydor 7.5 watt heater that I'm not using. I bought it for my pico reef (smaller then nano) but because the stupid thing is non adjustable I never used it. It's supposed to heat water to 5 degrees F above room temp.

    This heater will always stay on.
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  9. #7
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    Quote Originally Posted by corpusse View Post
    Hmm I have a hydor 7.5 watt heater that I'm not using. I bought it for my pico reef (smaller then nano) but because the stupid thing is non adjustable I never used it. It's supposed to heat water to 5 degrees F above room temp.

    This heater will always stay on.
    7.5w x 4 = 30w

    I think I might use some aquarium silicone for ease of removal but good strength and glue one of these to each of my primaries, both secondaries, and perhaps wrap one around the focuser of my larger telescope so I can heat eyepieces a bit to prevent fogging.

    I just got back inside from trying to find Hartley2 and the eyepiece seemed to be fogging up very fast even when my mouth was closed looking through it. I believe it was the moisture from my eye itself causing things to get foggy.

    This thread is very useful and helpful for poor people like myself that don't want to blow a ton of money on dew heaters.

  10. #8
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    I just read some reviews on amazon about the Hydor 7.5w mini and found this:

    Amazon.com: Customer Reviews: Hydor Mini Heater Aquarium Heater, 7.5 Watts

    Inconsistent and NOT SAFE to run dry, March 23, 2010
    By bookworm08 - See all my reviews

    This review is from: Hydor Mini Heater Aquarium Heater, 7.5 Watts (Misc.)
    The heating is inconsistent between units. I had two 1- gallon beta fish bowls near each other, each with it's own mini heater, and one was always much warmer than the other.

    Also, one day I accidentally left the heaters out after the changing the water (oops), and they both melted within an hour, so they are not safe to operate unless submersed in water, contrary to the product's description.

    While small, the "flat" heater tends to curl and is difficult to disguise in a small bowl. The suction cup provided often came loose.

    I am going to get larger bowls (2 gallons) and better water heaters. I do not recommend this product.
    So you may want to research the heaters before purchasing, and pay close attention to the temp when using them.
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    I've been keeping aquariums for many years now. Hadn't thought of repurposing an aquarium heater. Be careful though. Many of them will overheat and melt when not submerged in water.

    You might be able to accomplish the same task with a battery and a clear "nightlight" light bulb painted with high-temp engine block paint, which you should be able to get from an auto parts store.

    -Steve

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    sdtopensied is entirely correct. I am a tropical fish breeder and have small heaters in racks of tanks. Once I was cleaning a tank that I had drained to prepare it for a new batch of fry only to hear a loud crack and watch as sparks and smoke filled the aquarium. Turns out I forgot to flip the switch on the power strip for that block of tanks and the heater managed to crack open exposing the electronic coil and circuit to slightly salty water.

    One would hope that 7.5v would be fine on the back of a large piece of glass with a good thermal contact, but I think this warrants cautious experimentation before completely substituting equipment designed for the job with equipment not designed for the job.

 

 
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