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
Precision Submersible Heaters is rated 3.1 out of 5 by 25.
Rated 1 out of 5 by from Avoid these heaters. I bought two of these about 4 years ago. After about a year, the first one died - light would come on, but no heat. It was replaced under warranty. The second one died about 6 months after that. Again, replaced under warranty. The first replacement one died about a year ago, and was not replaced. The second replacement one died this morning. In all cases, the light came on but the heat did not, making it less likely to have the problem noticed. These are great heaters - for the first 6 months. They are not designed to last. I would strongly discourage anyone from getting these.
Date published: 2018-11-11
Rated 1 out of 5 by from Short Lifetime Model ML 90651. Worked for about a year. Now doesn't heat. LED blinks once every 5 minutes or so. By the time I package it, take it to UPS, pay shipping (2 directions) it is not worth it to bother with the warranty.
Date published: 2018-09-04
Rated 2 out of 5 by from O had a problem I bought a submersible heater and ot stoped to work. I bought here in Brazil and the store want not help me .
Date published: 2018-08-31
Rated 5 out of 5 by from Precise temperature Great heater that enables you to dial in a fairly precise temperature and also can double as your thermometer. Again, just a quality product from Marineland.
Date published: 2018-08-06
Rated 1 out of 5 by from Great visual design, poor mechanical design. Purchased the 300 watt visitherm heater for my new Marineland 75 gallon tank. Purchased specifically because I love Marineland products and the visual temperature gauge and the really nice temperature dial. Placed it in my new tank to stabilize the temperature before I transferred my fish from my smaller tank. Heater was working for two days but water was not heating up and a day later the heater stopped working altogether. I don't mess with electrical appliances regardless of the simplicity. Perhaps this one was just a dud but I was really disappointed it stopped working. The real pain is dragging myself back down to Petsmart to exchange it. And of course, there wasn't another one in stock so darn. Went ahead and used my old heater but it's not big enough though the water temp seems stable for now.
Date published: 2018-06-25
Rated 1 out of 5 by from Product does not work more than 2 months I bought the 300 watts heater cost between 50-60$ 2 months later just stopped working. Light on but not heating called company they replaced it 2 months later same problem called a second time. They agreed to send another But I was told by customer service life time warrant does not mean life time warranty and if it breaks again it will not be replaced( life time warranty means life time) . Very disappointed if marineland would make a good product I would not have to keep going through this. I have other heaters bought before this one all still working.
Date published: 2018-02-20
Rated 1 out of 5 by from Faulty safety shut-off I pulled the wrong plug when doing a water change so the heater didn't get unplugged. It was about 50% out of the water when it turned on, completely melted the plastic mounting bracket, but the safety shut-off never tripped. We unplugged it and carefully removed it from the tank, then went about pulling the strings of plastic out of the water. Yikes.
Date published: 2018-02-16
Rated 4 out of 5 by from Love the new look! I bought one of the old Visi-therm heaters about a year ago for my 10 gallon and when that one gave out on me I e-mailed customer service and they responded within one day and helped me get a new replacement heater. So far I love the new design, the black looks alot better than the light grey with the color scheme I have. And it isnt the most "accurate" on teperature -hence why I'm only rating it 4 stars- but then again my last one wasn't perfect either so can't complain.
Date published: 2018-01-14
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Is this heater fully submerged under water 

Asked by: Kenster56
Yes, this heater must be kept fully submerged at all times. BREX
Answered by: BREX
Date published: 2018-11-08

I bought a 150 Watt Precision Submersible heater from a Online store, that has stopped working?? According to the box which I still have, it says Lifetime Warranty. How do I go about getting it replaced?

Asked by: johnwainsworth
You would need to contact our Care Team at 1-800-322-1266. Please have your receipt ready for faster service. BREX
Answered by: BREX
Date published: 2018-10-11

My heater on the lowest it can go does 79 f and if I try to turn it lower it shuts off then never heats I have a 50watt that came with my 10 gallon kit I believe it might be an older model

Asked by: Pat6
Try unplugging it off for a few hours, then set it where you want it, and plug it back in. It should always be within 1-2 degrees of the proper temperature. It sounds like it is overheating and if so. needs to be replaced. BREX
Answered by: BREX
Date published: 2018-09-24

Can you please tell me the length of the 50 watt heater. I need to know how long it is from its top to the bottom.

Asked by: Catrina
Hello Catrina, That heater would be 8". We recommend providing 1-2 inches between the heater and the bottom/top of the tank as well. BREX
Answered by: BREX
Date published: 2018-09-12

I was planning on purchasing the 400w unit for my 100 gallon tank and i was wondering to what temperature it will heat the water?

Asked by: Bill the TD
Maximum temperature is 89 degrees Fahrenheit. It is fully adjustable, however, so you can set it from 68 - 89. BREX
Answered by: BREX
Date published: 2018-09-12

I have Marineland 20 gallon freshwater tank I bought as a kit. The Heater seems to be running very hot I have to keep unplugging it. When you look at the heater from the front of the tank is cool to the right or left? It goes hot either way I seem to

Asked by: Cory Catfish
You should see a + sign as well as a - sign on the top of the heater. Turning the dial towards the + sign will increase the temperature. Midway between the two marks represents 78 degrees. Be sure to have an accurate thermometer on the tank. Call 1-800-322-1266 if you need more help. BREX
Answered by: BREX
Date published: 2018-07-11

Can the visitherm heater be placed horizontally inside the tank?

Asked by: Jules76
Yes, as long as it is not resting on anything. BREX
Answered by: BREX
Date published: 2018-06-11

i have a 75 gallon aquarium, what size heater do I use?

Asked by: AMC19
For larger tanks like this we recommend a heater at each end of the tank. You can use two of the 200 watt heaters, each one is good for 55 gallons or two of the 250 watt heaters, each one is good for 70 gallons. BREX
Answered by: BREX
Date published: 2018-06-08
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ML90648 50-watt
ML90649 75-watt 
ML90650 100-watt 
ML90651 150-watt 
ML90652 200-watt 
ML90653 250-watt 
ML90654 300-watt 
ML90655 400-watt