Heater placed horizontal not vertical???

GoldFinger

Jack Dempsey
Original poster
MFK Member
Apr 14, 2017
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I really need to know if anyone has experience with placing your heaters in a horizontal position in your sump? The instructions say vertical for my EHEIM JÄGER 300W (model 3619)
 

soupa2

Plecostomus
MFK Member
Jul 18, 2007
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cyn
I had mine place flat on the sump also but I noticed some condensation inside the heater. After I just place them in an angle through a lava rock which came with holes. Nothing to worry about.
 

duanes

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Jun 7, 2007
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Isla Taboga Panama via Milwaukee
I always place "submersible" heaters horizontally in sumps.
And because the thermostat in the heater is usually above the heating element, and because heat rises, I believe they probably are more efficient in a horizontal option where they are not constantly flipping on and off.
 
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Drstrangelove

Potamotrygon
MFK Member
Oct 21, 2012
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Same. Horizontal is my preference. The only time I'd use vertical is when:

1) I'm certain that the water level will never go that low
2) water will constantly flow all across the heater

That might be true in a sump, but one would have to design the sump to be sure of that. It's never been true in any of my tanks, because I have always liked large water changes and because the placement of wood and rocks can sometimes restrict water flow.

Placing the heater low and horizontal in the sump would be my preference.
 
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