Visi-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.
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
Bought 5 of these heaters to place in tanks of various sizes. One year later there was condensation on the inside of several of them. Customer service was great, replaced all the heaters no questions asked; however, two of the new heaters nearly cooked two of my fry tanks. Will never buy another visi-therm.
These are very high quality products, and with any high quality product, you get excellent performance. I have never had a problem with the 2 of them in my 125 gallon, and I am not worried about my large Cichlids damaging them.
These heaters are great, accurate, and easy to use. I had a 50 watt visi therm on my 10 gallon for a few months now and it works great. It keeps the temperature consistently at 78 F. The only complaint is that I always have to set it slightly higher than the desired temperature, so for example, I have to set it to 80 to get the water at 78, but it still does the job really well. I recommend them over any other heater and will be getting another one soon for my new tank. Great product overall.
I use a 200W in my 25G tank and I set it at 78 degrees and the tank stays at 78 degrees. A pleasant surprise from other heaters. It is good it is so accurate because you practicaly need vise-grips to turn the temperature dial!!
In new 10-gallon I added a 50-watt heater (both packaging and store staff said that was correct size). Set at 76, heater produced 78 degree water fairly consistently. After 2 weeks, came home last night to find tank temp shot up to 85, which nearly killed fish and did kill my plants. Am replacing heater this morning; it still won't come even close to being accurate (now is set at 70 and producing 75 degree tank).
i use a 150watt for my 55gal, the heater is in the sump, the temp in the tank stays at what my heater is set to. relatively new heater though. since it's in the sump it hardly ever gets banged around, my only concern is that it just looks a little fragile for the price.
They're not necessarily low-cost, but not the most expensive either... but my experience has been great, mine is realiable, very easy to use, easy to read, easy to install, and i never have had to worry about it breaking or not keeping up...
"Visi-Therm a little pricey but a decent Submersible Heater"
A good heater but the adjustment knob need's to be a little bigger around.Have not had any major problems with this heater but it does loose a few degrees every once in a while. I use Visi-Therm & Ebo-Jager the Ebo in my opinion is a much better heater it is more acurate than the Visi-Therm and you can order the Ebo-Jager online cheaper than the Visi-Therm,Anyway yes i would highly recommend the Visi-Therm Heater anything Marineland put's out is usualy a pretty product.
1) The setting knob is too small. 2) One heater was retired after a years plus use because the setting knob became too stiff to operate. 3) Have lost 2 heaters to incidental exposure to air while on. Exposure to ANY glass part below the recommended max lower limit caused breakage. 4) Delicate. Lost 2 more heaters to being jarred by moving rocks around inside tank during cleaning. Verdict: I Do NOT recommend this heater! There are much sturdier built ones out there at the same price.
I started out with the non-submersible el-cheapo units, broke one and electrocuted my fish (tiger barbs, they were a menace, but they didn't deserve to die). The fish store recommended this heater to me, and this is what I have used ever since in the many tanks that I have had. They are completely submersible, which should not even be an option. The thermostat knob is a little small in diameter for my big fingers, but mine just keeps on working so I have no reason to replace it.
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