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Product Reviews
5493 reviews on 1118 products!

ProductsTemperature ControlHeaters
Aquarium Systems Inc. Visi-Therm Heaters
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Product Description:
Aquarium Systems Inc. Visi-Therm HeatersVisi-Therm automatic aquarium heater has a unique direct-reading temperature setting feature, which eliminates guess work and makes presetting temperatures very simple. The desired temperature is indicated on an easy-to-read thermometer-type scale and is accurately maintained by the precision thermostat. Visi-Therm is completely waterproof and totally submersible. All these features make it the choice of experienced aquarium hobbyists.
Product Specifications:
Available in 6-inch length 25 & 50 watts, 10-inch length 75 & 100 watts, 12-inch length 150 & 200 watts, and 14-inch length 250 & 300 watts
User Ratings: (47 reviews)
Overall: 7.16
Value/Cost: 7.34
Effectiveness: 7.09
Quality: 6.45
Ease of use: 7.79
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Found: 47 reviews Page  1 3 4 - View all
pdb has used this product for 1-3 Years.
Overall Rating: 4.5/10 April 28, 2005
"okay but there are better for the price"
I've owned two of these heaters in the past 3 years. The quality is okay but the temperature fluctutes a little more with these heaters and the temperature knob is extremely difficult to turn.. It's an o.k. heater but not up to ebo jager standards for about the same coin..
fish keeper has used this product for 3 Years or More.
Overall Rating: 7/10 February 7, 2005
"middle of the road"
Not a bad heater but not as good as ebo either. I tried ebo jager and probably won't buy any more of these.
aperseghin has used this product for 1-3 Months.
Overall Rating: 9/10 January 25, 2005
"Review the right product."
I notice alot of BAD reviews about GLASS breakinf. The new Heaters are plastic so make sure you are reviewing the right product. thease heaters are great. PERIOD.
aperseghin has used this product for 1-3 Months.
Overall Rating: 9/10 January 25, 2005
"Thats It ??"
i Have had trouble with the old style, hang in the tank heaters. This heater was so easy and acurate, in a few days i had a perfect temp set and it stayed like that... Period
Dykemyster has used this product for 1-3 Months.
Overall Rating: 4/10 January 7, 2005
"A dissapointment"
I bought 3 of these when they came out with the lifetime warranty and my guess is they will be in the red on the books with this product as these don't keep a constant temp, stick and just plain suck. I would not recommend this product to anyone as I believe it is a lesser product in many aspects and I have had issues with all three heaters. I had some of the older ones as well and they seemed to be a little better then the new ones and I would say that a Visi-therm is a Ford while an Ebo is a Lexus.
bstanley1 has used this product for 3 Years or More.
Overall Rating: 9.25/10 November 17, 2004
"Great Heaters!!"
I have been using these heaters on my tanks for years. they have never let me down. setting it up is trouble free. these heaters are effective and affordable. i will always use visi-therm heaters.
FishBaby has used this product for 3-12 Months.
Overall Rating: 6/10 August 11, 2004
"Setting Temp is a Pain"
I have had no trouble with the heater except for when I am changing the temp. The hardest knob I have ever turned. I had to get one of those plastic jar openers to assist me in moving the knob. I do like the stealth line of Visi-Therm, durable (made of plastic), black, and easy to set.
gibby9 has used this product for 0-1 Month.
Overall Rating: 9.5/10 June 22, 2004
"My second one has been great"
I ordered one from Big Al's and after a week in the tank it broke itself. I have no idea how, but I came home and a piece of glass from the side of the tube was laying on the substrate. It just blew right out, all on its own. No fish in tank, never dropped or smacked it, total mystery. Big Al sent me a replacement right out, no extra charge, and I love it. The new one works great and keeps the temp within 1 degree (200 watt model in a 42 galon). Maybe I originally got a bad one or it was damaged in shipping. In any event, they have a lifetime warranty from Marineland. I plan on buying more should I set up any new tanks.
rroads3 has used this product for 3 Years or More.
Overall Rating: 8.75/10 April 23, 2004
"10 Years and still working"
I have 3 of these one is 10 years old the other 2 are the new ones . Seams to work for me .
ray375 has used this product for 1-3 Months.
Overall Rating: 7.5/10 April 7, 2004
"Broken after 2 months."
I got a brand new Visi-Therm 100w for BigAl. Good built, good design, accuracy temp setting & compact size. I like it but after 2 months. Water leaking inside the tube. So I change to Rena Top Light.
RiftnReef has used this product for 3-12 Months.
Overall Rating: 6.75/10 February 18, 2004
"Could be better"
I've owend a couple of these heaters though I can't remember the sizes. The first problem I noticed was the temperature that it was set at, was NOT the temperature it ran at. If you have one, be sure to test it against an accurate thermometer. Both heaters ended up broken in a box in the attic.
hap_man has used this product for 1-3 Years.
Overall Rating: 9.5/10 January 23, 2004
"cannot believe all the problems some ppl have"
I have had visi-therms in both my 55 gal. and my 10 gal. tanks for 2 1/2 years now and I dont think the temp in either tank has ever varied more than a degree or two. In the 55 i have some large and active Haps and have never had a problem with any fish breaking the heater. A great product!
island dude has used this product for 3 Years or More.
Overall Rating: 7.5/10 January 5, 2004
"no big fish please!!"
these must be the most fragile heaters made. whenever my silver dollars accidentally swipes the heater you can actually hear the heating element shake! also callibration is a little off(mine is set to 86f to keep the tank at 82f)but not as bad as Acura heaters.looks like I have to order another Ebo Jager soon.
natealvis has used this product for 3-12 Months.
Overall Rating: 7/10 December 27, 2003
"it worked, for awhile"
i have had a visi therm 200watt heater in my 35 gallon saltwater aquarium, after six months of great use, it started over heating the aquarium, i have it now set at 75 degrees, but the therm says the water is 80 degrees, a great heater for six months, after that watch out...
Morphius has used this product for 0-1 Month.
Overall Rating: 6.75/10 November 1, 2003
"Marineland should hire me to test thier products."
I've been using the original Visi-Therms for years...the models that were originally designed and owned by Aquarium Systems. I had two 300watt original units in my 125gal. for four years(never gave a problem), finally they started to fail. So the first replacements I had in mind were...Visi-Therms. I noticed that Marineland had bought-out Aquarium Systems and decided to do an overhaul on these heaters. Why they felt the need to do that I do not know. The original heaters were very light, durable, accurate, the thermostat dial turned smoothly and the suction brackets held them to the tank firmly. What else does one need out of a heater? So now comes the Marineland update...The thermostat dial is really a pain in the but when you'd like to raise or lower the temp from inside the tank, one practically needs a friggin' pair of pliers to turn it! Then there's the suction brackets...they could disconnect if a Zebra Danio ran into them! The glass housing itself weighs twice as much with abunch of rubber logo laminate around them, which means more little crevices for algea to grow in, which in turn makes for a more difficult cleaning! Thennn they shortened the power cord by about 6"'s. Thennn they try to brush all this up by giving you brighter packaging with more pictures on the box....Whoooo Caaaares!!
Well that's my review, there you have it.
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