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Fluval Marina Submersible Heater for Aquarium 100W up to 30 Gallon $9.74

$9.74
+12 Deal Score
4,731 Views
Was looking for a small heater for my baby swordtail frays tank and found this. Not the all-time best price but still ~ 50% off regular sale price of ~ $17. Other sizes of the same product sale for ~$20 now. According to product picture this is for up to 30 Gal / 100 L of tank.

https://www.amazon.com/gp/product/B00AFELU1O/
  • Submersible heater for fresh or saltwater aquariums or reservoirs
  • Easy to read temperature settings
  • Impact-resistant glass design; Water proof sealing
  • Includes bracket with suction cups for easy, secure installation
  • Length: 8.5 Inch

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Deal
Score
+12
4,731 Views
$9.74
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Joined May 2010
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> bubble2 1,575 Posts
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cndealking
04-06-2020 at 08:54 AM.
04-06-2020 at 08:54 AM.
Waiting for a good deal on the tanks.
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Joined Apr 2019
L2: Beginner
> bubble2 84 Posts
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T23765
04-06-2020 at 09:26 AM.
04-06-2020 at 09:26 AM.
Quote from cndealking :
Waiting for a good deal on the tanks.

https://www.petco.com/shop/en/pet...allon-sale
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Joined May 2010
L6: Expert
> bubble2 1,575 Posts
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cndealking
04-06-2020 at 09:40 AM.
04-06-2020 at 09:40 AM.

thanks but I'm looking for some modern designs.
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Joined May 2010
L6: Expert
> bubble2 1,575 Posts
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cndealking
04-06-2020 at 09:40 AM.
04-06-2020 at 09:40 AM.

There was a Fluval deal from Walmart but I missed it.
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Joined Jul 2017
L4: Apprentice
> bubble2 323 Posts
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slicknod
04-06-2020 at 09:40 AM.
04-06-2020 at 09:40 AM.
Overkill for a 10 gallon portrait tank? Plan to house a beta in there.
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Joined Feb 2011
DealMaster
> bubble2 81 Posts
241 Reputation
Charlie007
04-06-2020 at 09:42 AM.
04-06-2020 at 09:42 AM.
Not bad. Thanks OP!
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Joined Dec 2013
L3: Novice
> bubble2 180 Posts
22 Reputation
twadec
04-06-2020 at 09:56 AM.
04-06-2020 at 09:56 AM.
I picked up the fluval flex 15 gallon deal, would this be a good heater or too high of wattage? In the reviews a lot of people talk about inaccurate temp settings too.
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Joined Nov 2018
Coleco Rust-Remover
> bubble2 1 Posts
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GilGunderson
04-06-2020 at 10:02 AM.
04-06-2020 at 10:02 AM.
Quote from slicknod :
Overkill for a 10 gallon portrait tank? Plan to house a beta in there.
Bigger than one really needs for a 10 gallon but not too high a wattage, it will heat the tank to a set temp but a higher wattage will simply do it faster. Also consider that a 100W is physically larger than a 50W so measure how it will fit in your tank. Also depends on how cold it gets in the room where your fish are. You need more watts to bring a tank from 60f to 75f than bringing it from 75f to 80f. That will all be on the heaters spec sheet. In any case don't trust the thermostat, always have a separate thermometer and calibrate it to that.
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Joined May 2010
L2: Beginner
> bubble2 25 Posts
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a333366
04-06-2020 at 11:29 AM.
04-06-2020 at 11:29 AM.
I'd err on the smaller side. Common failures for heaters are power loss or faulty temperature sensor. With the former, your tank drops 10-15 degrees. With the latter you fish get hot. If you get an overpowered heater, "hot" could mean you're cooking them. E.g. 30gal heater for 5gal fry tank. Room temp will definitely play a role, too.

I've read some people recommend 2 half power heaters to help with malfunctions, too.

In any case a separate thermometer is a good idea to pair with any heater.
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Joined Jun 2011
L3: Novice
> bubble2 178 Posts
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SininStyle
04-06-2020 at 12:09 PM.
04-06-2020 at 12:09 PM.
The thermostat is a starting point, aside from that they are useless. That goes for all aquarium heaters. that dial is never correct because they are mass produced using a single spec and assume the metal used in it is precise.
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Joined Mar 2006
L7: Teacher
> bubble2 2,505 Posts
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HiHungryIAmDad
04-06-2020 at 12:12 PM.
04-06-2020 at 12:12 PM.
I can't speak for the 100W but I'm 0 for 5 on the 300W heaters in this line. 2 out of the box would not power on at all. 3 failed after 1-3 weeks.
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Joined Jun 2011
L3: Novice
> bubble2 178 Posts
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SininStyle
04-06-2020 at 12:31 PM.
04-06-2020 at 12:31 PM.
Quote from cisengineer :
I can't speak for the 100W but I'm 0 for 5 on the 300W heaters in this line. 2 out of the box would not power on at all. 3 failed after 1-3 weeks.
Wow, that is not a glowing review at all.I could really use like 9 of these for a rack. Now I'm not so hopeful.
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Joined Mar 2005
L6: Expert
> bubble2 1,140 Posts
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Original Poster
mozillafirefix
04-06-2020 at 04:03 PM.
04-06-2020 at 04:03 PM.
Quote from slicknod :
Overkill for a 10 gallon portrait tank? Plan to house a beta in there.

I'm right now using a 150w heater for my 5 gal baby tank and it still works fine, except it looks ginganic in the tank. As another SDer mentioned, as long as it does not malfunction and boil the tank water, it'll be ok for your 10 gal and my 5 gal, I believe.
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Joined Sep 2012
L4: Apprentice
> bubble2 318 Posts
30 Reputation
BCNugget
04-06-2020 at 11:13 PM.
04-06-2020 at 11:13 PM.
Quote from angeow :
I'd err on the smaller side. Common failures for heaters are power loss or faulty temperature sensor. With the former, your tank drops 10-15 degrees. With the latter you fish get hot. If you get an overpowered heater, "hot" could mean you're cooking them. E.g. 30gal heater for 5gal fry tank. Room temp will definitely play a role, too.

I've read some people recommend 2 half power heaters to help with malfunctions, too.

In any case a separate thermometer is a good idea to pair with any heater.

I agree. Go small. I had a heater failure while I was away for a few days. Came home to an aquarium at 100f.
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