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Marineland Precision Heater for Saltwater or Freshwater Aquariums

4.2 4.2 out of 5 stars 4,262 ratings

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300-watt

Purchase options and add-ons

Brand MarineLand
Product Dimensions 1.63"W x 16.44"H
Wattage 300 watts
Heat Output 300 Watts
Style Indoor Installation
Capacity
80 Gallons
Power Source
Corded Electric
Material
Plastic
Item Weight
11.68 ounces

About this item

  • This 300 watt heater is for aquariums up to 80 gallons. Adjustable temperature dial allows you to set the temperature 1 degree with every click.
  • Thermal Switch automatically turns off as temperature rises above an internal preset and turns back on once it cools down.
  • The advanced heating element contains a mica core surrounded by a mesh heating element for superior heat transfer with enhanced durability
  • Advanced mounting bracket securely attaches to glass and provides 3 window positions to view the temperature display
  • Easy to view sliding scale tells the exact temperature setting. Top dial view shows the setting from an additional location.

Customer ratings by feature

Easy to read
4.0 4.0
Suction power
3.6 3.6
Accuracy
2.9 2.9
Temperature Control
2.8 2.8

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From the manufacturer

Marineland continues to be one of the leaders in innovative aquatic environments and equipment.

As manufacturers and fishkeepers ourselves, we take great pride in making quality products. We also enjoy making the hobby fun, educational, and easier for our fellow fishkeepers. That's why we've assembled the best information to help ensure you're successful, and your fish are healthy and happy.

The Marineland Micron Cartridge polishes the water by removing fine particles, leaving the water sparkling clean. The micron cartridge works efficiently on its own and may also be "charged" with diatomaceous earth to further increase polishing efficiency and speed.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3.94 x 1.63 x 16.44 inches; 11.68 ounces
  • Item model number ‏ : ‎ ML90654
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ January 31, 2011
  • Manufacturer ‏ : ‎ Marineland
  • ASIN ‏ : ‎ B00NETRY44
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.2 4.2 out of 5 stars 4,262 ratings

Looking for specific info?

Product Description

Get precise control of your aquarium temperature with the Precision Submersible Heater. This Heater combines an adjustable temperature dial, a high visibility temperature display and an advanced heating element to keep your aquarium water at the optimal temperature for your freshwater or saltwater fish. The Precision heater also includes a thermal switch which will turn off once it rises above an internal pre-set temperature, and turns back on once it cools down, making your aquarium safer for you and your fish. This 300 watt heater is designed for aquariums up to 80 gallons.

Important information

Directions

Directions: 1. Attach the suction cups (included) to the double suction mounting bracket. Slide bracket over heater to position indicated. 2. Place heater in aquarium by firmly pressing suction ends against wall surface. The three-position viewing window allows you to view the temperature setting from three possible angles, simply turn the heater until it locks into the best viewing position. Note: Choose an algae free location with adequate circulation. This ensures even heat distribution and optimum operation. No part of the heater housing should contact aquarium gravel, rocks or decorations. 3. Wait at least 15 minutes before plugging in your heater. The on off indicator light will confirm that the power is on. Note: Before plugging in heater, create a drip loop: to prevent water from reaching receptacle. 4. Select the desired temperature. Turn the "Click Set" temp select dial until the point of the red light on the thermometer scale reaches the correct setting. Most tropical fish like 78*F - 81*F water. Note: It is recommended to use a tank cover to prevent water temperature variances to heat loss. Both can impair heater performance, create a hazardous environment for the fish.

Customer reviews

4.2 out of 5 stars
4.2 out of 5
4,262 global ratings

Customers say

Customers are satisfied with ease of installation, and suction of the pet supplies. However, some customers have reported issues with quality and water capacity. They mention that it failed after 3 months of use, and that it developed moisture inside. Customers also differ on temperature, performance, value, and consistency.

AI-generated from the text of customer reviews

26 customers mention26 positive0 negative

Customers find the installation of the pet supplies to be easy. They mention that it's super easy to set up and operate. Some say that it is attractive, durable, and easy to read.

"Easy to use and works great." Read more

"I love this product. Cool looking, great design, easy and reliable to use. I had one of their first 100w versions made back in the early 90's...." Read more

"...It's super easy to set up and operate. Just set the dial and forget about it...." Read more

"Easy to use and read. Updated Sections at back work well." Read more

19 customers mention15 positive4 negative

Customers like the suction cups of the pet supplies. They say the sucker cups are good, work well, and are easy to manipulate. The product is able to stick to the inside of a homer and holds on to a glass aquarium.

"...Again, this is acceptable for my application.Suction is great, haven't had any problems with it moving around or becoming detached." Read more

"...This heater is able to stick (with the mount) to the inside of a homer bucket and heat the water that I am preparing...." Read more

"...I have it mounted on it's side and the suction cups seem to be working just fine as long as the glass/acrylic is clean." Read more

"...And it was great, until it wasn't. The suction cups are absolutely useless. But, ok I can live with that...." Read more

393 customers mention192 positive201 negative

Customers are mixed about the temperature of the aquarium heater. Some mention that it keeps their temps in the zone, is accurate, and holds the temperature steady without any fluctuation. However, others say that the light works but it doesn't heat at all, and has made maintaining tank temps a breeze.

"I’m using this to heat my 30 gallon tank and it’s so efficient I had to turn it down once it’s set to the temperature you need you just set it and..." Read more

"...red light that indicates it's on, gets turned on but the heater does not heat up at all. I cleaned it, I turned the dial around...." Read more

"Warmed up the tank and is keeping a steady temperature (see right corner of picture)" Read more

"...It hasn't been maintaining the temp. I always unplug during water changes and don't let the water level drop in between...." Read more

348 customers mention194 positive154 negative

Customers are mixed about the performance of the pet supplies. Some mention that it works well as expected, flawlessly, and accurately. The red LED "ON" light is very easy to see that it's working, and the updated sections at the back work well. However, others say that it quit working and suffered due to faulty operation.

"...This heater has a bright red LED "ON" light which is very easy to see that its working. Am very pleased with this product." Read more

"...I started using it last month. But within a month the heater has stopped working...." Read more

"This is a solid heater. I have it in a 40 gallon breeder and it's working great." Read more

"...of reviewers seem to have had the same issues I had with it working only a few weeks...." Read more

115 customers mention51 positive64 negative

Customers are mixed about the value of the pet supplies. Some mention it's excellent, worth the money, and works well for its price point, while others say it'll only last a month and is a waste of money.

"...I got 6 months out of the first one, and it failed without me noticing it...." Read more

"Great products and good price" Read more

"...I've had the heater less than 3 months, and it's not so great. The thermostat adjustment is no longer accurate...." Read more

"...I measured it to be +/- 1° from set temp. The price is ok and it works as intended." Read more

34 customers mention18 positive16 negative

Customers are mixed about the consistency of the pet supplies. Some mention it's very accurate, reliable, and stable, while others say that it'll be pretty off in accuracy and inconsistent. The intervals are different.

"...Temperature control is via dial. It matches my separate thermometer, so accurate, but it's not very fined grained, so not overly precise...." Read more

"...Now I set the temperature to 80 and will reach 86. So it's pretty off in accuracy...." Read more

"This heater compared to several others is by far the most accurate. I measured it to be +/- 1° from set temp...." Read more

"...If it maintains a constant temp will be ok but surprised it is so inaccurate." Read more

235 customers mention58 positive177 negative

Customers are dissatisfied with the quality of the pet supplies. They mention that it fails after 3 months of use, is inaccurate, and unreliable. Some say that the heater arrives broken and has clear water stains and signs of usage.

"...One review says it burnt out the second day, one lasted 2 weeks, one lasted one month, one caught on fire after 2 days...." Read more

"...The red light will flicker and sometimes go off completely. It hasn't been maintaining the temp...." Read more

"This is a solid heater. I have it in a 40 gallon breeder and it's working great." Read more

"I bought two of these and one died in less than a month. The other one is still working. I hope it doesn't die as well." Read more

35 customers mention0 positive35 negative

Customers are dissatisfied with the water capacity of the pet supplies. They mention that it leaks, fills with water, and develops moisture inside. Some say that the aquarium water drops drastically and condensation forms on the inside.

"...it finally showed signs of ware, with condensation and dripping forming on the inside. Not to mention I was last using 100wts on a 60 gallon tank...." Read more

"...It's kind of ugly.It developed moisture inside of it which is usually a red flag for heaters...." Read more

"New. Was leaking water inside once installed. A little dangerous?" Read more

"...The second one I ordered at the same time as the first one started to leak water inside of it after a couple days...." Read more

Does its job and holds up well
5 Stars
Does its job and holds up well
I’m using this to heat my 30 gallon tank and it’s so efficient I had to turn it down once it’s set to the temperature you need you just set it and forget it.
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Top reviews from the United States

Reviewed in the United States on March 20, 2024
Size: 150-wattVerified Purchase
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5.0 out of 5 stars Does its job and holds up well
Reviewed in the United States on March 20, 2024
I’m using this to heat my 30 gallon tank and it’s so efficient I had to turn it down once it’s set to the temperature you need you just set it and forget it.
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Reviewed in the United States on April 8, 2023
Size: 250-wattVerified Purchase
3 people found this helpful
Report
Reviewed in the United States on January 3, 2024
Size: 150-wattVerified Purchase
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5.0 out of 5 stars Working great, with accurate Heating
Reviewed in the United States on January 3, 2024
I got a really nice price so I purchased this when my Cobalt Heater stopped working after a year. It seems for my long 20 gallon I need 150 watt even though the Marineland Chart shows 75 watt for 20 gallons would work. This came preset at 78. I plopped it in, let it sit for 20 minutes, then plugged it in. When I checked my manual thermostat, it read exactly 78 degrees after 6 hours or so. I turned it down 1 degree to 77 because it is winter currently and did not want it running more often. The water looks clearer and maybe that brown algae that started appearing will go away. Only kind of drawback is it is so big and can't touch gravel. It looks like something out of the Borg. And the long side because of weight I guess tends to dip the suction cup down a bit, and I can't keep it perfectly straight. But I was having trouble heating my tank so something this powerful was needed. The temperature on the heater is somewhat hard to read. I think it shows 76 when it should show 77 but that's why I have a backup thermostat in the tank.
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One person found this helpful
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Reviewed in the United States on March 20, 2024
Size: 100-wattVerified Purchase
Reviewed in the United States on June 11, 2023
Size: 250-wattVerified Purchase
9 people found this helpful
Report
Reviewed in the United States on February 4, 2024
Size: 200-wattVerified Purchase
One person found this helpful
Report
Reviewed in the United States on March 11, 2024
Size: 250-wattVerified Purchase
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5.0 out of 5 stars Works Great
Reviewed in the United States on March 11, 2024
Warmed up the tank and is keeping a steady temperature (see right corner of picture)
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Reviewed in the United States on February 20, 2024
Size: 50-wattVerified Purchase
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5.0 out of 5 stars Amazing customer service!!!
Reviewed in the United States on February 20, 2024
I had bought a returned Marineland Precision Submersible heater (50w) because it was half the price of a new one. However, like 3 weeks later the heater quit working. Not long after I contacted Marineland directly (by email). They got back to me about a day later. Now 6 days later I'm with a NEW Marineland Precision submersible heater (50 watt). FREE OF CHARGE and YES that include FREE SHIPPING TOO. AMAZING customer service!!!
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2 people found this helpful
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Top reviews from other countries

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Guillermo soto martinez
5.0 out of 5 stars Llego en buenas condiciones
Reviewed in Mexico on November 11, 2023
Size: 400-wattVerified Purchase
Diane Cote
5.0 out of 5 stars Fiable, prix raisonnable
Reviewed in Canada on April 7, 2023
Size: 200-wattVerified Purchase
HUGO OMAR RUIZ ZUÑIGA
1.0 out of 5 stars Me llego producto usado y roto
Reviewed in Mexico on December 9, 2021
Size: 300-wattVerified Purchase
Jesús Aaron Lara Romo
5.0 out of 5 stars Sumergalo unos 30 minutos antes de usarlo
Reviewed in Mexico on December 7, 2022
Size: 75-wattVerified Purchase
Amber Kovacs
5.0 out of 5 stars Super fast shipping
Reviewed in Canada on February 26, 2020
Size: 150-wattVerified Purchase