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 3.4 out of 5 by 20.
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
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
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I need to run 2 smaller physical size heaters in an 80 gallon. Can you recommend a wattage for each? Thank you

Asked by: Lefty
You need to have at least 2, 200 watt heaters. BREX
Answered by: BREX
Date published: 2018-02-23

I have a 10g aquarium kit w.o temp manuals. The heater it came with doesn't have the temperatures on the dial. Are the temp positions the same as the one with the numbers listed and does it auto turn on and off? Also, please explain the thermometer strip

Asked by: Jenn111
You should have a + sign, a - sign and a arrow or triangular mark. The latter represents 78 degrees. Start with it set there, give it several hours to bring the temperature up in the tank then move it one click in the direction you need to adjust the temperature - + to increase the temperature, - to decrease the temperature. Nothing to explain. Peel the back off and stick it to the outside of the tank in a location that is visible to you, but does not disrupt the view of the tank. BREX
Answered by: BREX
Date published: 2018-02-21

Can I purchase the clip and suction cups for this heater? I would like to purchase two if possible. Thank you.

Asked by: KathyDip
Of course, here you go: BREX
Answered by: BREX
Date published: 2018-02-12

The heater can be fully submerged even the temp dial? 

Asked by: Ashley1142
Yes, correct, even the dial can be submerged. BREX
Answered by: BREX
Date published: 2018-02-01

Is the heater completely submersible (including the dial and clicker at top?

Asked by: Lillie
Yes, it is fully submersible Lillie! You can leave the black rubber part up out of the water if it is easier for you, but all of the glass must be submerged, at all times. BREX
Answered by: BREX
Date published: 2018-03-18

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: 2018-03-26

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
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