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Heater Question...

854 Views 4 Replies 5 Participants Last post by  Diana
Is a 150 watt Jager heater enough for a 75 gallon tank? I have the temperature set at 76 deg and so far, the heater seems to have no trouble maintaining it. The room temperature is around 72 deg year round, with some fluctuations in the summer. The lights seem to help warm the water during the day. I also have a 200 watt Tetra heater that I can use, but I was wondering if it would be necessary.
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It's generally a good bet to double up, so as to reduce the load on one heater and create a backup in case the heating element on one of them fails. In your case, however, if the max it will ever have to heat is 4 degrees or so, you'll probably be fine. If you wanted, you could put the Tetra heater in there and set it a few degrees lower, just in case. In theory, it should never come on unless - for some reason - the ambient temperature drops and the Jager can't keep up. But the Jager is excellent.
Tetra heaters suck. I have a 200w in my 29g that struggles to keep the temperature up to 77 degrees like it's supposed to. My tank got accidentally unplugged overnight and the temp dropped to 66 degrees, and it literally took three days and a warm water change to heat it back up. It won't be able to handle a 75g.

Jagers are among the best heaters. They are highly efficient, so I think a 150w would work in a 75, but I also agree with Kevmo911: double up. A 75 gallon is a long tank, so it's best to put in two heaters, partly because one heater tends to have a difficult time maintaining a consistent temperature throughout the tank, but also as a safety catch. If one should die for some reason, you have a second one to keep the tank from dropping to dangerous temps.
i dont ever use two heaters it just more crap in the tank, that ebo should work just fine as long as u have good water movement. the ebos are pretty decent used to be better when hand made but thats forever ago. i try and have the heater near a intake or outlet so the flow helps heat everything and keep it more stable
Tank Size Heat 5ºC/9ºF Heat 10ºC/18ºF Heat 15ºC/27ºF
5 gal/25 L 25 watt 50 watt 75 watt
10 gal/50 L 50 watt 75 watt 75 watt
20 gal/75 L 50 watt 75 watt 150 watt
25 gal/100 L 75 watt 100 watt 200 watt
40 gal/150 L 100 watt 150 watt 300 watt
50 gal/200 L 150 watt 200 watt two 200 watt
65 gal/250 L 200 watt 250 watt two 250 watt
75 gal/300 L 250 watt 300 watt two 300 watt

a quick guide
If the tank is only 4 degrees warmer than the room then about 2-3 watts of heat per gallon is fine.
But if the tank ever cools off (power is out and the room cools off) it will take a while to reheat the tank. This may be a good thing, a day or two to gradually warm up may be safer for the fish.

A large tank holds the heat really well, so it won't cool off as fast as a small tank in a cool room.

If the room starts cooling off (power out) you might put a thick towel around the tank to help maintain the temperature until power comes back on.

Lights, pumps and other equipment all add to the temperature in the tank, but when the power goes out all these things quit, too.

it is not so much will the heater work under normal conditions (it will)
the problem is that it might be a bit too small in case of emergency.

Maybe that is where the Tetra heater can help. Add it to the tank to help it come back to temperature then remove it.
Also, if the real heater ever dies the Tetra can help you until you get to the store to buy another good heater.
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