Precision Submersible Heaters

Precision Submersible Heaters
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Product No. ML90648-00
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  • Adjustable temperature dial clicks through each degree for accuracy
  • Thermal switch automatically turns off past max preset and resets once the temperature lowers
  • Advanced mica core heating element for efficient heat transfer and enhanced durability
  • Three window positions to view the temperature display

Suction clips to secure heater

I have a heater that the suction cup clips have broken. Can I get the clips to secure it to the side of the aquarium?
Asked by: path9845
Yes, please call or email us directly. BREX
Answered by: BREX
Date published: 2016-01-14

I have a 10 gallon tank for my Betta fish. Do I need the Precision Submersible Heater

Product No ML90648-00
Asked by: Ilipsc12
Yes, you do need a heater. I would recommend the 50 watt Precision heater to keep him at 80-84 degrees Fahrenheit. BREX
Answered by: BREX
Date published: 2016-01-08

Why is my Precision 300 Watt Heater not working?

My Precision 300 watt heater is only a few months old and has only been plugged in when its been submerged, but it isn't working. It doesn't get warm (not even a bit) nor does the light come on (ever). It worked perfectly for the first little bit, but then stopped. It's not an electrical issue because everything else works from the same outlet the heater is plugged into. Help! Why is my heater not workingt?
Asked by: jmfonzy
If the heater ever became exposed to air, for example, during a water change, there is a safety feature that would shut it off. Once this valve turns over, the heater is done. This may have happened at some point, unknowingly. Additionally, a lot of people think the heater is not working but it is really the thermometer, so if the thermometer is reading a temperature LESS than your room or house temperature, this is NOT a heater issue. In the meantime, if the heater definitely is not working, please send it back to us for a replacement. BREX
Answered by: BREX
Date published: 2016-01-05

i have a vth 300 heater can i put this on the bottom of the tank laying horizontaly?on gravel or must it be vertical?

Asked by: Gilly
It can be horizontal but cannot be laying on the gravel or the glass, pressing against anything, etc. BREX
Answered by: BREX
Date published: 2016-01-24

Best position for the heater

I have 2 questions. Reading the posts, you've mentioned that it is best to place the heater near the bubbler or filter so as to be near a source of circulating water. I've got a 29 gallon aquarium, 150 watt Marineland precision heater, no bubbler and a whisper 30 power filter. 1-Do you recommend me placing the heater below the filter, or to the left or right from the filter? (Does it matter?) Also, I've read varying suggestions as to place the heater horizontal, vertical, or at a diagonal. 2-Is one of these positions better than another? Thanks, Bobby
Asked by: BobbyK
Hello. I also a have 150 watt heater on my 29 gallon tank. I am running a Penguin 200. I keep my heater vertically to the left of my filter (opposite side of the intake). My heater is almost roughing the left wall and is right next to the filter. Position or orientation does not really matter but placing it near the filter improves the circulation of water water throughout the tank.
Answered by: JojoP1777
Date published: 2016-01-04

heater full of water

Hello I recently had to replace two heaters one does not turn on, the other one filled up with water .How do you go about a warranty claim?
Asked by: brentvan
I recently had to return a faulty heater due to water intrusion. You can call the company's headquarters under the "Contact us" page or you could send an email, which is found under the same page. Calling will be faster and more direct but email will only take a day or two at most. These heaters have a lifetime warranty so when you send your initial email or phone call, you need to have the code at the back of the rubber cap of the heater (where the dial is). This code is needed to send you a new heater. Hope this helps.
Answered by: JojoP1777
Date published: 2016-01-04


will this melt my plastic 3 gallon tank? and i also need a light that fits my little tank. thanks
Asked by: alpha
I don't think you tank is actually plastic but rather acrylic. Regardless, the heater will not melt your tank. If you need a light, please look under the lighting section.
Answered by: JojoP1777
Date published: 2016-01-05

Product No. ML90648-00

Hello, I just purchased these heater at the beginning of October, and I noticed yesterday (11/30/15), when I stuck my hand in the water it felt cold, the temp in the tank had dropped to 72 degrees. I unplugged the heater and plugged it back in but could not get it to work. I took it from the tank and put it in a pitcher of water and got it to come back on, but it seams that every time I put the temperature knob under water it would shut off again. The directions said fully submersible and the heater only had a minimum water level mark on it so I am not sure what the problem is. I had the temperature set at 79 (it was the one down from 82). I would like to know if this is a faulty heater. It has been working for the last 10 hours, but I can't shut my aquarium lid because it only works with the knob above the water.
Asked by: JHHHHHHH
I have never heard of a heater functioning only with the knob out of the water. They usually either heat....or don't heat.....if there is an issue. The water level has to be above the minimum water line but the heater does not have to be fully submerged. I would add a second thermometer to verify the temperature, and leave the heater installed the way you prefer to have it installed, and observe the temperature for several hours (at least 12 hours). If both thermometers indicate the temperature is cold, then yes, the heater is not functioning properly and you would qualify for warranty assistance. Make sure nothing is pressing against the heater, such as plants, rocks, wood, etc. BREX
Answered by: BREX
Date published: 2015-12-02

Please inform where the aquarium heater is made?

Please inform where the aquarium heater is made, still made in Italy or it is made in China now?
Asked by: AleW
China. BREX
Answered by: BREX
Date published: 2015-11-30

What is the setable temp range.

What is the high and low setting for the adjustable thermostat? I could not find it listed.
Asked by: Junoflydog
65-89 degrees Fahrenheit BREX
Answered by: BREX
Date published: 2015-11-19

Internal thermostat

Does this heater have an internal thermostat and if so does this mean I can place it below the water line horizontally near the bottom for a fry tank
Asked by: Carl393
Yes it does, and yes, it is fully submersible. It can be vertical or horizontal, it just needs to be in a filled aquarium and not buried or with anything pressing against it. BREX
Answered by: BREX
Date published: 2015-09-11

Could the heater control the temperature into 55c ?

Asked by: Joanna
The Precision Submersible heaters have a maximum temperature setting of 89 Fahrenheit, which would be 31 Celcius. If you were to raise the temperature to the 55 Celcius then the temperature in the tank would be approximately 131 degrees Fahrenheit. The standard recommendation for tropical fish is 78 degrees Fahrenheit. MINI
Answered by: MINI
Date published: 2015-09-04

Indicator light on the precision submersible heater

Help me find the location on tube
Asked by: Omagoff
The indicator light on the Precision Submersible Heaters should be in the middle of the circle at the bottom of the red temperature gauge that is along the length of the heater. MINI
Answered by: MINI
Date published: 2015-08-31

Does a pre-set heater mean that the temperature is already set?

I have a pre-set heater? Does this mean that the temperature is already set? The test strip shows 80 degrees but the water feels cooler than that. How can I be sure that the temperature is correct. I couldn't find a dial to set it. Also, There was a red light on when I first plugged it in. Now the light is not on. Does this mean the temperature has reached the correct setting?
Asked by: 5kitties
A pre-set heater is set to keep the water between 76 and 80 degrees. Keeping an eye on the thermometer is how you know if the heater is working correctly or not. At this time of year, it will rarely turn on. This is why you aren't seeing the light at this time, because the heater does not need to be on. One thing that helps is to know what the room temperature is in that room and compare it to the tank temperature. If the tank temperature is lower than the room temperature, that is a broken thermometer. If they are exactly the same, then either the room is just very warm or the heater is not working. BREX
Answered by: BREX
Date published: 2015-07-20

Heater Confusion

I purchased the Marineland 29gal Starter Kit back in January, and everything has been working great so far. The tank was initially upstairs, and I would see the heater light blink on periodically through the day. Recently, we had to move the tank downstairs. The AC unit is currently broken downstairs which keeps the temperature inside around 80 in the summer. My heater has and is set for 80, and the light hasn't blinked on since we moved the tank downstairs. Is that because it doesn't need to come on until the AC cools the house off again? Or do I need to replace my heater?
Asked by: Hannah938
It is because it is not needed at this time. If the house is at 80, the water temperature will not drop below that temperature, so the heater is not going to come on. BREX
Answered by: BREX
Date published: 2015-06-22


Should i avoid putting this heater above or around my bubble wall? Does it make any difference, does it help or hinder? Where is the best place for this heater?
Asked by: knastabooh
The best place to put a heater is near the most water movement. This helps to circulate the heat around the tank, so we usually recommend near a filter or a bubbler. BREX
Answered by: BREX
Date published: 2015-06-04

fully submersible

Are your heaters fully sunbersable or does the top needed to be above the water.
Asked by: swatcapt
They are fully submersible. BREX
Answered by: BREX
Date published: 2015-07-17

heater isn't working

I bought the heater about 4 to 6 weeks ago, it looks like the ones on your site, but the dial for the temperature control is red, not gray. At first it was doing what it was supposed to and was maintaining my 10 gallon tank at the 80 degrees I set it for. But the past several days the red light blinks if it comes on at all and the water temperature is now in the low 70s. There's no drafts or air conditioning near the aquarium. I can't afford to replace the heater again for at least 2 more weeks. The one that came with the 10 gallon aquarium kit was running hot and no matter how I adjusted the dial (only had plus and minus signs) it was keeping my aquarium in the upper 80s. Any suggestions for a reliable and affordable heater? Since both heaters are fron Marineland I have to say I'm not too happy with your heaters so far.
Asked by: DeeJ
From your description of the heater, I think you have a Visi Therm, not a Precision. Your heater has a lifetime warranty. Please give us a call direct so we may assist you under warranty. 1-800-322-1266. BREX
Answered by: BREX
Date published: 2015-07-01

Does anyone else's heater do this

My marinland heater used to turn on and off like it's supposed to. But now the light is apse aye on even after I unplugged then plugged it back in. I don't really know if it's working or not. Any suggestions
Asked by: Jpderouin
If you unplugged the heater, the light would have to go off as there would be no electrical current running to it. I think you may be seeing a reflection that makes it look like it is on, when it is not. The red molded piece inside that is for adjusting the temperature has tricked a couple of consumers into thinking the light is on, when it is not. BREX
Answered by: BREX
Date published: 2015-04-13

What heater for what size tank?

For example 37-40 gallon? Thank-you
Asked by: T123
The way you figure that out is to calculate 3-5 watts of heat per gallon of water. If the house tends to be cooler, calculate at 5 watts. So for the 37-40 gallon tank, you would want a 200 watt heater, for example. BREX
Answered by: BREX
Date published: 2015-03-31

Should this heater be permanently fully submersed in a horizonatal position ?

Other than the title on the packaging saying that it is "submersible", there is nothing in the instructions saying that it can be kept underwater indefinitely in a horizontal position. Everything about it looks like it should be kept upright in a tank. I am apprehensive about going horizontal since my last "submersible" heater just boiled my Turtle's "fish friends" to death.....seriously Need better instructions ! Thx David R
Asked by: davidryck
Heaters can be horizontal or vertical. They cannot be buried in gravel or covered at all, so no rocks lying against them, plants pressing up against them, etc. Once plugged in, they cannot be exposed to air which is a risk with turtles, since turtles tend to loosen them and then cause them to float up. I don't use aquarium heaters in my turtle tanks as they are fine at temps from 65-74 degrees Fahrenheit. Those temps are typically the average room temperature in most homes. I do use a basking light and a uvb light of course. Approximately 1-2 percent of all heaters on the market will fail at some time, either by not heating or over heating. This is a very low percentage of the millions of heaters out there. BREX
Answered by: BREX
Date published: 2015-08-16

Is the heater working?

I purchased a marineland 55 gallon starter kit. The light on the heater itself doesn't stay on constantly. I purposely filled tank with cold water to watch the heater work. The thermometer provided with the kit is currently reading 76 degrees. Also one of the suction cup brackets broke and the rubber bottom of the heater is touching the back if the tank. Is the heater working? Is the lack of a second suction cup a problem?
Asked by: Simpson
The heater turns off when the aquarium reaches the desired temp.
Answered by: Fishguy2345
Date published: 2015-08-16

mounting positions

Can this heater be mounted horizontally?
Asked by: alexander
Yes. It can be mounted vertically or horizontally
Answered by: Fishguy2345
Date published: 2015-06-06

Will this fit into a 5.5 Gallon tank (10 in height)?

Asked by: Marn
You need a 25 watt heater and we do not make one in that wattage in this line. There is one in our Visi Therm line and it would fit as it is specifically for small tanks like yours. All of our heaters can be installed horizontally or vertically in any tank. BREX
Answered by: BREX
Date published: 2015-07-01

Will your heater do this?

I have a "heater canister" from Lifegard Aquatics. I need a minimum of 400 watts in either a 1/2" or 1" heater diameter and sensor location in the heaters tube at least 1" down from the insertion depth. Will your 400 watt model meet these requirements?
Asked by: Gunny
The approximated dimensions for our Precision 400 heater are: 18" in length, 1" diameter on glass tube portion, 1.5" diameter on the plastic "knob" portion at the top. This heater is not intended to be used in a canister or sump setting, but rather in an aquarium itself. ML2
Answered by: BREX
Date published: 2015-01-16

What wattage heater do I need for a 44 gallon aquarium for aquatic turtle

Asked by: RSBerger
Depends on how much water you intend to put into it. I would recommend filling it 3/4 of the way up. In this case, I would use a 100 watt heater. BREX
Answered by: BREX
Date published: 2015-02-10
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