Your right Synnir..the electrical ones are 3', it's the gas ones that are 6'.
But I still don't reccommend putting one in a closet and walking away from it...that's just an accident waiting to happen. Like all these houses you see burn down in the winter, because the residents were poor (not saying you are poor) and have to use space heaters, but usually place them in inadequate spaces and end up catching their houses on fire
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*smithrc* That is a radiator...I thought that might have been what you were referring to, but wasn't sure. That would actually be a great option...if you are willing to spend that kind of money. Those were very popular since Victorian Times (yay for Design classes huh? lol), but even though they don't put out "alot" of heat I think they would be a great viable option...if you can get around the price.
/off mom mode
I think a 20L would be overly plenty (and rather heavy)...or two 10 gallons would hold 20 fry boxes (assuming you are using something comparable to beanie boxes)...just put some of that plastic canvas in between them so they can't readily see each other all the time. Just have to make sure they aren't too heavy for your shelf once water is put in them.
Keep in mind 1 gallon of water = 8.33 lbs (or 3.7854118 liters), so it can get really heavy really quick.
Beanie boxes fit very well side by side, I mean they are only 4" x 4" boxes
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