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my dew heater has been on for almost 2 years non stop

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#1 Tim

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Posted 22 February 2021 - 11:35 PM

Since building my observatory and never wanting to have dew or moisture around the optics. With a belief that a little gentle heat is a good thing (no idea if that's true)

 

I Leave my dew heater on all the time doesn't matter when or the season its always on - medium to low setting. I have never had dew on the optics and it doesn't seem to cause any issues.

 

Anyone else leave the dew heaters on?

 

How long can you expect a dew heater to last? 

 

I am guessing the dew heater power supply might go first, really no idea.



#2 alphatripleplus

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Posted 23 February 2021 - 09:08 AM

I have a dew heater that is  a few decades old, but I don't run it 24/7 -only when I set up my scope. I expect it will last  a long time, but I would be worried about checking the power circuit occasionally.


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#3 decep

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Posted 23 February 2021 - 08:07 PM

This is probably not a likely failure scenario, but it is the worst case:  your dew heater PWM controller fails and is permanently set on a 100% duty cycle.  Would it be okay to run at 100% for days/weeks unmonitored?



#4 sberrada

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Posted 23 February 2021 - 10:27 PM

Hi

 

i have had mine on for more than 6 months continuously on scopes and mounts.

 

i cover my scopes with Telegizmo light cover and  keep my dew heaters on.

This is valuable winter and summer

 

they generate little heat so I am not worried even if they are at 100% for weeks on.

 

sam 


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#5 ram812

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Posted 24 February 2021 - 12:35 AM

It would be prudent to at least verify everything is working properly from time to time (Call it scheduled maintenance), I'd rather be safe than sorry😉! Regularly checked, why not?FWIW
CS!

#6 SonnyE

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Posted 24 February 2021 - 01:05 AM

I think your dew is probably warm and cozy...

 

You may want to see how things are fairing under the dew strip. You may have cooked the telescopes finish.


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#7 Tim

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Posted 25 February 2021 - 10:04 PM

Hi

 

i have had mine on for more than 6 months continuously on scopes and mounts.

 

i cover my scopes with Telegizmo light cover and  keep my dew heaters on.

This is valuable winter and summer

 

they generate little heat so I am not worried even if they are at 100% for weeks on.

 

sam 

I typically keep Telegizmo cover over mine to in the observatory in case i get any dew from the ceiling or a possible leak dripping down.   I am going to check the paint - not sure its enough heat to do anything.    I have heard of people putting in a light bulb to add some heat and keep things above ambient temperature.



#8 Wow!

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Posted 25 February 2021 - 11:47 PM

seems like a waste of power to me. I switch mine on when needed.



#9 dclt

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Posted 25 February 2021 - 11:53 PM

The idea of leaving the dew heaters on all the time seems unnecessary.
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#10 sberrada

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Posted 27 February 2021 - 10:05 PM

Hi,
The reason I keep mine on all the time is partially to remove humidity and partially to raise temperature since it is very cold.
I monitor my temperature and humidity in the observatory and it is often at or near 100%.
The temp drops to -20C regularly during peak winter, so a little extra heat helps.
The mild heat helps to keep things dryer but I also keep dessicant inside the Telegizmo.
The cost is negligible - about $2 / month
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