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 3.6 out of 5 by 18.
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
Rated 2 out of 5 by from Trouble w/ 400 Watt Heaters I've purchased two and both have condensation INSIDE the unit within a week. This is extremely worrisome to me.
Date published: 2018-01-01
Rated 1 out of 5 by from 1 month? I purchased the 400w and it only lasted 1 month. Pretty frustrating when you have a reef tank and have your temps drop overnight.
Date published: 2017-11-23
Rated 5 out of 5 by from Guarantee Great company. It did poop out at plug after about a year, but they replaced it, no questions other than "what is your address?"! Valerie
Date published: 2017-10-06
Rated 1 out of 5 by from Junk I have had aquariums for 40 years. It seems all products have been cheaping out over the last five years and charging ridiculous prices for this non funtional product. These are no exception. I have had it for less than a year. Clearly the seals are no good. The temp hasn't been steady and it started whistling about a month ago. I bought a different brand heater and we will see how that goes. What good is a lifetime warranty if you have to just get another piece of junk from Marineland. I am going to attempt returning to the place of purchase for a refund.
Date published: 2017-08-07
Rated 2 out of 5 by from Heater failure. I've had this heater for a little over ~7 months now and it worked great. Until recently I noticed my fish getting lethargic. I felt the water and it was extremely cold. The heater has not warmed up even after unplugging, turning up the heat and down and I believe it has failed. It hasn't even been a year with it.
Date published: 2017-05-27
Rated 4 out of 5 by from Quality Product and Fantastic Customer Service The title says it all I have Marineland heaters in all my tanks and I typically get about 2-3 years out of each heater but they keep my tank at a very steady temp and when they die they are replaced in a timely manor. I couldn't ask for much more out of a product and company. Photo is for Marineland, you guys kept your end of the warranty up and I kept my word about terminating the old heater.
Date published: 2017-02-20
Rated 5 out of 5 by from Great Features I purchased this heater to replace and older one. I am so pleased with the features as well as the performance. I also like how it blends in with the tank. It's so easy to set and read. I'm impressed!!! As always Marineland has produced a great product!
Date published: 2017-01-12
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Does "fully submersible" include the temp dial? Should the temp dial at the top be under water?

Asked by: Keccbond
Yes, it means that the entire heater is fully submersible, including the dial. The dial does not have to be under water, but the water level line should have water above it. BREX
Answered by: BREX
Date published: 2018-01-16

Is the top supposed to light up when it's "heating"

Asked by: Mbarkerco
No, there should just be a red "dot" near the top of the heater. It is pretty darned bright and you may see some reflection around it, making it appear the top is lit up, but no, it should not be. BREX
Answered by: BREX
Date published: 2018-01-15

How much of the heater needs to be underwater?

Asked by: Blizzardman8
All of it, it is fully submersible. BREX
Answered by: BREX
Date published: 2018-01-15

Is there a recall on ml90638?

Asked by: Cooter
No, we have never had a recall on the VisiTherm or Precision heaters. BREX
Answered by: BREX
Date published: 2018-01-08

I have a 10W Mini Heater for my 5 Gal. Tank. Is there a light that shows it's on ?

Asked by: Mia Mouse
No, that heater does not come with a light. You should be using a thermometer in conjunction with it to ensure the water temperature is proper. BREX
Answered by: BREX
Date published: 2018-01-08

I have a heater in each tank. One is set for 77 and a red light is always on. The other is set for 80 and there is no light on- I believe a red light use to be on all the time. Is it still working?

Asked by: Liss
The light is not supposed to be on all the time, it goes off when the tank is at the proper temperature. To determine if all is correct, you need an aquarium thermometer to read the water temperature. Always have one or two of these installed on a tank and take at least one reading daily. BREX
Answered by: BREX
Date published: 2018-01-05

My ML90648 50w heater has been working flawlessly for overe two years, but I just broke the mounting bracket (piece w/ suctions cups). Is that part available as a replacement? How / where could I get one?

Asked by: DJ Saberniak Jr
Order it from our site. http://www.marineland.com/Products/aquarium-parts/Heaters.aspx BREX
Answered by: BREX
Date published: 2017-12-20

Are theses heaters fully submersible? 

Asked by: Cyndih
Yes, they sure are! BREX
Answered by: BREX
Date published: 2017-12-04
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