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  • Marineland Visi-Therm Aquarium Heater, 25-Watt
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Marineland Visi-Therm Submersible Aquarium Heater


List Price: $29.99
Price: $19.00 & FREE Shipping on orders over $35. Details
You Save: $10.99 (37%)
Only 12 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
25-watt
  • Visible temperature setting with sliding scale which clearly displays the exact temperature and new top view dial setting
  • Easily set the temperature through accurate click set dial which adjusts 1 degree Fahrenheit with every click
  • Mounting bracket securely mounts to the aquarium and has three window positions to enable temperature viewing from multiple angles
  • Trial-equipped thermostat uses lower voltage to turn the heater on and off and provides superior performance and reliability
  • Efficient heat transfer from a mesh heating element with a mica core and epoxy fill
  • Visible temperature setting with sliding scale which clearly displays the exact temperature and new top view dial setting
  • Easily set the temperature through accurate click set dial which adjusts 1 degree Fahrenheit with every click
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7 new from $15.29
$19.00 & FREE Shipping on orders over $35. Details Only 12 left in stock (more on the way). Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Marineland Visi-Therm Aquarium Heater, 25-Watt + Marineland Rite-Size Cartridge Z, 3-Pack
Price for both: $25.93

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Product Description

Size: 25-watt

Marineland visi-therm submersible heaters feature a direct-set control which ensures accuracy to within one degree. these guaranteed durable heaters make setting and controlling the temperature of your aquarium easy. simply set the temperature on the top dial which corresponds to the temperature scale on the side of the thermometer. in addition, the heater features a mounting bracket which is easy to install and enables viewing of the temperature from multiple angles. this heater is cull-approved and is suitable for marine and freshwater aquariums.

Product Details

Size: 25-watt
  • Product Dimensions: 3.9 x 1.6 x 10.2 inches ; 8.8 ounces
  • Shipping Weight: 8.8 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B00345U2HY
  • Item model number: ML90438
  • Average Customer Review: 3.2 out of 5 stars  See all reviews (96 customer reviews)
  • Amazon Best Sellers Rank: #38,105 in Pet Supplies (See Top 100 in Pet Supplies)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

I will not be buying another one of these heaters.
Sarah
These heater worked well after purchase but failed after about an year of use.
Oats400
The temperature is easy to set and it's very consistent.
ChachiTonks

Most Helpful Customer Reviews

16 of 16 people found the following review helpful By Liz on December 8, 2012
Size Name: 250-watt
I had a marineland Visi therm heater in my marine aquarium and for no reason the glass on it cracked. The heater was in a water level controlled sump where it was never in contact with moving objects of fish so user error is NOT an issue here.

A large section of glass simply "fell" off and exposed all the live coils to the water. The heater smoked and stunk the entire room out.

Everything in my tank was electrocuted to death instantly and I am now out hundreds of dollars in livestock.

NEVER EVER EVER EVER buy this product.
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19 of 21 people found the following review helpful By Renbutsu TOP 500 REVIEWER on May 12, 2013
Size Name: 50-watt Verified Purchase
I've been keeping aquariums for many years. Through the years, I've used many different brands of heaters, Visi-Therm heaters are usually my go to brand for heaters. No, they are not perfect, they have their failures too, but in general I don't have much problems with them and they are readily available and affordable. Occasional one will fail but more than not, they work as advertised. I've used them in small tank, medium size tanks, 5 gal buckets, freshwater, saltwater, etc. Sometimes I read that the temp setting on the heater is off because the temp on a thermometer is different. That's really not an issue, go by your thermometer and just set the dial on the heater to hit that temp. If you have to set the dial pointing to 80 to hit your thermometer reading of 78, then do it. The increments on the heater can be just notches, set it and don't concern yourself with the difference. As long as the heater comes on and off consistently, that's all the matters.

I recommend you undersize it, so if the manufacturer calls for a certain watt for your gallon tank, go grab the next lower one. This is because there are most likely other equipment in your tank that will generate heat, such as pumps and lights, plus with the decor or rocks taking up space in the tank, the manufacturer recommended size may end up be too much for the tank.

Also, if you have a large tank that calls for a high wattage heater, go with two smaller watt heaters that add up, this is so if one fails and sticks on, you have a less likely chance of your livestock being "cooked", or if one fails and does not come on, the other can help prevent the drop in temp.

UPDATE 11/27/13: my Visitherm failed, looking back to when I purchased it, it lasted ~ 10 months, maybe even less.
Read more ›
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8 of 8 people found the following review helpful By TheTSpurg on March 22, 2013
Size Name: 100-watt Verified Purchase
I purchased this on January 7th, 2013 and came home on March 18th only to find it no longer working (water temperature at 70) and a number of my fish now sick (one dying from Dropsy) and I am pissed. It barely worked when it worked at all. The temperature of water never matched the setting on dial. I plead with you NOT to buy this product. I just purchased the Via Aqua Titanium heater and it is AWESOME! You can't go wrong.

Update: The Via Aqua didn't last either.I ended up purchasing the Fluval E Electronic Heater 300-watt on April 4th and it's been perfect. Fluval E 300-Watt Electronic Heater
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10 of 11 people found the following review helpful By Harald Striepe on March 29, 2012
Size Name: 150-watt
I originally had a 50W Marineland Stealth Pro, which has worked perfectly in 6G Fluval Edge with a nice design - small and dark to blend in with the plants in the back, and a clear dial and pilot light at the top and not in the tank, where it distracts. That one was recalled due to explosion and fire hazard, and unfortunately has not been reissued.

As a replacement, Marineland sent a Visi-Therm of equal power. It has a more obtrusive design making it harder to hide, and a bright pilot light very obvious at night. But it initially worked ok.

However, after a couple of months it failed open, and the tank started cooling. I caught it right away, and did not lose anything. And this is better than exploding and blowing the tank out.
Disappointing nevertheless...

My brother had the opposite experience with this heater losing his fish due to a thermal run away.

I think, I am done with Marineland.
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8 of 9 people found the following review helpful By Sera on August 27, 2010
Size Name: 25-watt
I was very skeptical getting this heater at first. Because first off, there were no reviews regarding this ANYWHERE. So I kinda took a shot in the dark buying this one after searching hours for a heater for my 2 gallon aquarium.
It may be more expensive than other heaters for small aquariums but so far.... I think it's worth it.
It's getting the job done. I love how it doesn't look tacky in my aquarium (I was worried it would look really bulky) but it blended in just fine. It has it's own holder (so you don't have to worry about it dangling in the aquarium like a rabid lizard) And my Betta fish loves it :) He's currently "resting" underneath it.
And I love how you can adjust the water temperature by actually seeing NUMBERS. Other heaters let you control the water temperature blindly and making you unplug it when the water gets too hot (which in my opinion, is fish murder). This heater has an automatic switch so it turns of by itself when it gets to the desired water temperature.

Safe to say, SO FAR, this is the best heater I've had. =)
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14 of 17 people found the following review helpful By Anthony Ramirez on September 26, 2010
Size Name: 25-watt
TO ANYONE CONSIDERING THIS HEATER:

I have had this heater for about 5 months now. It worked great for that period of time but today I came home after being out of town overnight and the temperature in my tank was a whopping 91º!!!!! As this is a saltwater aquarium, everything survived....LUCKILY!!! You may have different luck with this heater than I did but be warned that the thermostat may just decide to stop working and cook your fish while you sleep!
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Marineland Visi-Therm Aquarium Heater, 25-Watt
This item: Marineland Visi-Therm Aquarium Heater, 25-Watt
Price: $29.99 $19.00
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