Glass aquarium heaters will break if there isn't enough water to cover them and dissipate the heat in an even way. In freezing temps in a hen house it would shatter as soon as the water level dipped, but it would still be plugged in, yes? So then we go to electrocution hazard plus glass shards in the water. There was a brand of metal aquarium heaters, the only ones ever to be UL listed, but those were higher wattage and have been discontinued.
Also, if a bird should peck on the cord and it comes in contact with water (which it is submerged in for submersible heaters) there is an electrocution risk. Which is why, although I probably have 20 aquarium heaters, last winter I didn't try one. They are safe enough in aquariums, but intended for larger volumes of water than my chicken waterer, and unless I figure a way to maintain a higher level of water in my 5 gallon chicken waterer, I will probably build a tin can water warmer.
and yes, I'll have to go find a light kit somewhere. Cookie tins I now have.
Also, if a bird should peck on the cord and it comes in contact with water (which it is submerged in for submersible heaters) there is an electrocution risk. Which is why, although I probably have 20 aquarium heaters, last winter I didn't try one. They are safe enough in aquariums, but intended for larger volumes of water than my chicken waterer, and unless I figure a way to maintain a higher level of water in my 5 gallon chicken waterer, I will probably build a tin can water warmer.
and yes, I'll have to go find a light kit somewhere. Cookie tins I now have.
Last edited: