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

My 90648 -00 heater, was replaced in six months with a 90439 and replaced with another 90439 on Jan 30 2016. Third heater in less than 2 years.Heating a ten gallon tank to max 75,room temp 70 Am I under power? Have not had this many issues in 40 years

Asked by: mad fish
Thank you for your support of Marineland products! No, you are not undersized. Customer feedback has indicated that heaters may fail due to: - their being exposed to air during a water change or because of water evaporation - build up of hard water deposits, algae, etc., over time - burying them in gravel or having ornaments, etc., pressing against them Please contact us directly if you require further assistance at 1-800-322-1266. BREX
Answered by: BREX
Date published: 2016-12-30

temp range on this heater is??? from what to what? I know it can heat to 80 at least but I need to only heat up to 68degrees. can this be set that low?

Asked by: cold weather
Thank you for your interest in this Marineland product! The range is 65-88 degrees Fahrenheit. BREX
Answered by: BREX
Date published: 2016-12-19

Are they fully submersible?

Asked by: ReefinLuis
Thank you for your interest in this Marineland product! Yes, they are fully submersible. In fact, you can position them either horizontal or vertical in the tank. Just make sure they are not buried in the gravel and do not have anything pressing up against them. BREX
Answered by: BREX
Date published: 2016-12-15

what size heater do I need for a 40 gallon tank?

Asked by: Brett6500
Thank you for contacting us! Typically, we recommend around 5 watts per gallon of water, so for your tank, around a 200 watt heater should suffice. BREX
Answered by: BREX
Date published: 2016-12-12

What is the exact length of the 50 watt heater (including the dial on top)?

Asked by: scottb
7". BREX
Answered by: BREX
Date published: 2017-01-08

I have had this 50W heater for a little over a week. It worked great to keep my 5 gallon tank at 79 degrees. Now however it is on all of the time and the tank sits barley above 75. What when wrong?

Asked by: Novorapid
Thank you for contacting us! If the water level dropped and exposed the heater, this may have caused an issue. Make sure the tank is covered appropriately, at all times, as well. And last, check the temperature with a second thermometer as the first one may not be working properly. Assuming that it is working correctly, did the house get cooler due to a cold front, weather wise? If you are unable to resolve this issue, please call us at 1-800-322-1266 so we may assist you. BREX
Answered by: BREX
Date published: 2016-11-28

What size heater (wattage) do I need for a 20 gallon freshwater aquarium?

Asked by: John Junior
Thanks for your question! Typically, you want 3-5 watts per gallon of water, depending on your home's room temperature. The cooler the house, the more wattage you need. So on average, you want a 100 watt heater for a 20 gallon tank. BREX
Answered by: BREX
Date published: 2016-11-28

Can i use the 50 watt in a 2.5 gal betta tank?

Asked by: Hann
That could be a bit much for that small of a tank. If the room he is in is pretty chilly, it should be okay since it is an adjustable heater. BREX
Answered by: BREX
Date published: 2016-10-11

Which way do I turn the dial to lower the temp setting?

Asked by: Dwingo
You would turn it towards the lower temperature settings. There are numbers around the dial if you are viewing from the top, and a vertical array of settings on the front of the heater as well so you can view it from the front too. If you cannot see either for some reason, turn the dial counter clockwise. BREX
Answered by: BREX
Date published: 2016-12-31

What size heater do I need for your 20 gallon tank? My present Marineland heater is still working but the black rubber is falling apart. I purchased the whole kit at Petsmart about five years ago.

Asked by: Cheri
You typically want about 5 watts per gallon so around 100 watts would be perfect for your tank. BREX
Answered by: BREX
Date published: 2017-01-08

Will this heater cool the water also? I am looking for a submersible type cooler with a temperature dial that I can set the temperature at about 65 degrees and let it keep the water cool for my hydroponics system.

Asked by: Burger Bob
No, it is only a heater. You are looking for a chiller. This is a very expensive piece of equipment most often used by marine hobbyists. It runs approximately $800+. Try websites such as www.marinedepot.com. BREX
Answered by: BREX
Date published: 2016-09-27

I have the 50watt heater in my 5 gal take for my betta and it has begun flickering instead of being solid. Do I need to replace it?

Asked by: BettaGirl47
No, this is just a light issue, and does not necessarily reflect how it is heating. Check your thermometer regularly and make sure the temperature is maintaining correctly. If it is, you are fine, if it fluctuates more than a degree or two, irregularly, then I would replace it. BREX
Answered by: BREX
Date published: 2016-09-09

I have a 50 watt ro2983 out of a topfin 10 gallon set up. it does not state if it is fully submersible at all in the instructions.  I assumed it was so I submerged it.  No light ever came on.  I kept the dial at the line it was set on. what's wrong?

Asked by: Amamda
It is indeed fully submersible. At this time of year, however, the water may be warm enough to not need a heater. Be sure to have a quality thermometer on tank and check the temperature at least once daily. Also, make sure you do not have the heater installed with the light on the backside. BREX
Answered by: BREX
Date published: 2017-01-08

I would like to make a return on a heater i bought two years ago. How might I do so?

Asked by: Marty99
You would need to email or call us directly, 1-800-322-1266, cut the cord of the heater, provide us with a picture of the heater with cord cut, and the lot code off of the heater, along with your information. Once the heater is replaced, your warranty is fulfilled. BREX
Answered by: BREX
Date published: 2016-07-26

How do you reset the heater?

Asked by: jeffmr
Unplug it, and let it sit, in the tank, for at least 15 minutes. Set the temperature where you want it to be, and plug it back in. BREX
Answered by: BREX
Date published: 2017-01-08

What happens if you don't let the heater sit for 15 minutes before plugging it in?

Asked by: jeffmr
It will not acclimate to the tank water temperature properly, and either crack, explode, or just not read correctly, causing it to not heat properly, and needing to be re-set. BREX
Answered by: BREX
Date published: 2017-01-08

I have a biocube 14 with the heater in the back middle chamber and a nanobox tide mini led light. The temperature in the tank reads 76 when the heater is set to 69. Why is this?

Asked by: jeffmr
At this time of year, it is easy to a tank temperature to be high. I assume you cannot see if the heater is turning on or off since it is in a back chamber, so you can try unplugging it for a day and seeing if the temperature drops. If it doesn't, then I would say that your room temperature is the issue. I don't use heaters in my tanks at this time of year, for this reason. It generally isn't necessary, unless you are really cranking the AC. If the temperature does drop, then the heater may not be working correctly or being in the back chamber does not allow for enough circulation, creating an issue with properly heating the tank. BREX
Answered by: BREX
Date published: 2016-06-28

How do I get one of the clip-ons that hold the suction cup? One of mine broke out of the box.

Asked by: chipmunk
Just call or email us with your information. 1-800-322-1266 or techsupport@marineland.com BREX
Answered by: BREX
Date published: 2016-06-13

Is a VISI THERM Type VTH150 submersible?

Asked by: Anonymous
Yes, it is fully submersible and should be at all times. BREX
Answered by: BREX
Date published: 2016-06-06

Can you use a heater and if so which one is recommended for your cylinder tank?

Asked by: Dawnee
If you are referring to the 6 gallon Pillar tank, yes, you can use a heater from 25-50 watts with this tank. BREX
Answered by: BREX
Date published: 2016-05-23

I am just wondering, but how much does this cost for a 65 gallon fish tank?

Asked by: Robert Guiney
You would need at least 5 watts per gallon of water or at least 325 watts total, so I would recommend either two of the Precision 200 watt heaters or one of the Precision 400 watt heaters. Pricing will depend on where you purchase them but they retail for between $26 and $45. BREX
Answered by: BREX
Date published: 2016-05-02

I am looking for replacement suction cups and maybe even the holders as well for the heaters, where can I get them? Thanks

Asked by: justaname
We do not sell these separately, I will email you for your information. BREX
Answered by: BREX
Date published: 2016-05-02

I have my heater set for 76 degrees. the light on the heater keeps flickering on and off for a few minutes, then it will go off for hours. When I test the temperature of the water, it is around 72 degrees. What is the issue with my heater?

Asked by: carrcs
Good morning, Thank you for your inquiry. Please double check the thermometer to make sure it is working correctly as well. If so, then we would be able to help you in regards to the matter directly at 1-800-526-0650 with our Customer Care Line.
Answered by: MINI
Date published: 2016-03-31

I recently purchased a 10 gallon tank that includes your OEM aquarium heater. I set the thermometer to the line in between the + and -, trying to achieve a 78 degrees. I noticed the other day the light is off, is this normal?

Asked by: paige
Good morning, Thank you for your inquiry. The light will come on and off during the regulation of the 78 degree temperature in your tank. If the light is on, this typically indicates that the tank temperature has fallen below 78 degrees and the heater is heating the tank back up. If the light is off, then the tank should be at a steady 78 degrees. We would recommend that you place a thermometer strip on the tank to make sure that everything is correct in your tank. MINI
Answered by: MINI
Date published: 2016-03-31

What is the actual temperature of the heater? If heating the water to 84 degrees, does the tip heat to 130 degrees, or some other temperature, until turning off?

Asked by: doctor of fun
It is approximately 130 degrees Fahrenheit. BREX
Answered by: BREX
Date published: 2016-03-23

I have water in where it shows the temp? Is that ok?

Asked by: Tkb2564
Some minor condensation, such as droplets is okay. More than that would not be okay. BREX
Answered by: BREX
Date published: 2016-03-22

I bought the 20 gallon tank kit today. How do I turn on the heate . I have it completely submerged. I plugged in and waited 15 minutes. Now what. 

Asked by: TNicole76
You should have a + (plus) sign and a - (minus) sign, along with a triangular mark sort of in the middle between them. The mark represents 78 degrees Fahrenheit. To turn the heater on, place it in the tank for 15 minutes THEN plug it in. Set the dial so that the pointed portion points toward the mark in the middle, then leave it for several hours. Check it periodically, over 24 hours to do any fine tuning adjustments that may be needed. BREX
Answered by: BREX
Date published: 2016-03-22

My Precision worked perfectly the first week, but now I have to adjust it a lot to keep the water around 80 degrees. It has gotten so far out of wack that the reading on the dial is 77, but 2 thermometers read 82. Can it be re-calibrated?

Asked by: Donna74
I must report that my heater is working perfectly again. It was the new LED light overheating the water. Although to my touch, I could barely feel any heat at all from it, I did notice a change when I opened the aquarium cover to allow for more air circulation. Thankfully, I have fish that don't typically jump. But if needed, I now have a little 4" desktop fan to disperse the heat from the lights. Thanks so much.
Answered by: Donna74
Date published: 2016-03-15

What is the gauge on the front for? First day of use gauge read about 78 with temp control set at 78. Second day heater gauge dropped to 65 and has stayed there. A second separate temp gauge is reading 78. There is random condensation on the gauge.

Asked by: SeaSalt
The gauge is actually part of the knob on top of the heater. It simply allows you to see what temperature you have set the heater at, from the front. It cannot move on its own at all, so I'm not sure how you saw it "drop to 65". It only moves when you twist the knob up top. You would need to have a thermometer separate from the heater, on the tank in order to be able to determine what the water temperature is at any given time. BREX
Answered by: BREX
Date published: 2016-03-10

My heater won't let me shut if off and the temperature keeps fluctuating. What is wrong with the heater.  One moment it is too hot & a day or 2 later it is cold. We just got a new thermometer and know that's not the problem. What's wrong with our heater?

Asked by: JP06
Heaters typically do not fluctuate. They will run cold or too warm, but not fluctuate between the two. You may have an environmental issue like sun coming in through window, a drafty area of the house, some other piece of equipment causing the issue such as some filter systems or lights. Use two thermometers, different styles to compare the temperature. BREX
Answered by: BREX
Date published: 2016-03-07
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