I would like to make a return on a heater i bought two years ago. How might I do so?
You would need to email or call us directly, 1-800-322-1266, cut the cord of the heater, provide us with a picture of the heater with cord cut, and the lot code off of the heater, along with your information. Once the heater is replaced, your warranty is fulfilled.
Date published: 2016-07-26
What happens if you don't let the heater sit for 15 minutes before plugging it in?
It will not acclimate to the tank water temperature properly, and either crack, explode, or just not read correctly, causing it to not heat properly, and needing to be re-set.
Date published: 2017-01-08
I have a biocube 14 with the heater in the back middle chamber and a nanobox tide mini led light. The temperature in the tank reads 76 when the heater is set to 69. Why is this?
At this time of year, it is easy to a tank temperature to be high. I assume you cannot see if the heater is turning on or off since it is in a back chamber, so you can try unplugging it for a day and seeing if the temperature drops. If it doesn't, then I would say that your room temperature is the issue. I don't use heaters in my tanks at this time of year, for this reason. It generally isn't necessary, unless you are really cranking the AC.
If the temperature does drop, then the heater may not be working correctly or being in the back chamber does not allow for enough circulation, creating an issue with properly heating the tank.
Date published: 2016-06-28
I recently purchased a 10 gallon tank that includes your OEM aquarium heater. I set the thermometer to the line in between the + and -, trying to achieve a 78 degrees. I noticed the other day the light is off, is this normal?
Thank you for your inquiry. The light will come on and off during the regulation of the 78 degree temperature in your tank. If the light is on, this typically indicates that the tank temperature has fallen below 78 degrees and the heater is heating the tank back up. If the light is off, then the tank should be at a steady 78 degrees. We would recommend that you place a thermometer strip on the tank to make sure that everything is correct in your tank.
Date published: 2016-03-31
I bought the 20 gallon tank kit today. How do I turn on the heate . I have it completely submerged. I plugged in and waited 15 minutes. Now what.
You should have a + (plus) sign and a - (minus) sign, along with a triangular mark sort of in the middle between them. The mark represents 78 degrees Fahrenheit. To turn the heater on, place it in the tank for 15 minutes THEN plug it in. Set the dial so that the pointed portion points toward the mark in the middle, then leave it for several hours. Check it periodically, over 24 hours to do any fine tuning adjustments that may be needed.
Date published: 2016-03-22
My Precision worked perfectly the first week, but now I have to adjust it a lot to keep the water around 80 degrees. It has gotten so far out of wack that the reading on the dial is 77, but 2 thermometers read 82. Can it be re-calibrated?
I must report that my heater is working perfectly again. It was the new LED light overheating the water. Although to my touch, I could barely feel any heat at all from it, I did notice a change when I opened the aquarium cover to allow for more air circulation. Thankfully, I have fish that don't typically jump. But if needed, I now have a little 4" desktop fan to disperse the heat from the lights. Thanks so much.
Date published: 2016-03-15
What is the gauge on the front for? First day of use gauge read about 78 with temp control set at 78. Second day heater gauge dropped to 65 and has stayed there. A second separate temp gauge is reading 78. There is random condensation on the gauge.
The gauge is actually part of the knob on top of the heater. It simply allows you to see what temperature you have set the heater at, from the front. It cannot move on its own at all, so I'm not sure how you saw it "drop to 65". It only moves when you twist the knob up top. You would need to have a thermometer separate from the heater, on the tank in order to be able to determine what the water temperature is at any given time.
Date published: 2016-03-10
My heater won't let me shut if off and the temperature keeps fluctuating. What is wrong with the heater. One moment it is too hot & a day or 2 later it is cold. We just got a new thermometer and know that's not the problem. What's wrong with our heater?
Heaters typically do not fluctuate. They will run cold or too warm, but not fluctuate between the two. You may have an environmental issue like sun coming in through window, a drafty area of the house, some other piece of equipment causing the issue such as some filter systems or lights.
Use two thermometers, different styles to compare the temperature.
Date published: 2016-03-07
My 200w heater (ml90443) stop working after about a month. Light stays on,but not heat up. What's the problem?
Make sure you are checking a thermometer to determine the temperature of the water. Most people seem to go by the way it "feels". At 78 degrees, it will feel cold to you. If the water temperature is the same as the room temperature, then you are correct, the heater is not working. In this case, call our Consumer Relations Team directly for assistance. 1-800-322-1266.
Date published: 2016-03-04
My Heater is flickering on and off rapidly. Is this normal?
The light may flicker, yes. This does not mean the heater is not heating properly. As long as the light goes on/off periodically and the temperature is correct as per whatever thermometer you are using, the heater is functioning correctly. However, if it is having additional issues, I would recommend contacting our Consumer Relations Team at 1-800-322-1266 for further assistance.
Date published: 2016-03-02
Small bubbles forming on 200 watt Visi-Therm Submersible Heater
Just started using a new in the box 200 watt Visi-Therm Submersible Heater and it works great in my 55 gallon fresh water aquarium set at 78 degrees! Small bubbles gather all over the heater in random fashion around the unit from the indicator light down to the bottom of the heater. I wipe them off and they come back the next day. I'm using the unit vertically with the enclosed mounting bracket. I am not using a bubblier or any such device and the heater is not coming into contact with anything within the aquarium. After two weeks of wiping bubbles off the unit every day, I gave up and just let the bubbles form as they may. (Item number ML90443-00) (Bar Code number 047431904439). One more: Can I adjust, (slide from top to bottom), the enclosed suction cup bracket anywhere along the unit? Thank you very much!
That is normal, all heaters tend to form little gas bubbles like that.
The suction cup bracket should be within the top half of the heater, not the lower portion.
Date published: 2016-02-16
how long is the 50 watt heater?
What is the length of the 50 watt heater?
Typically the lenght of a 50W heater is going to be approximately 6" long.
Date published: 2016-03-20
thermal switch safety feature on the precision submersible heater
I was looking through the Q&A on this product, and was a little confused. One answer stated that if you forget to unplug the heater during a water change and the heater is not fully submersed, it will shut off and once it is submersed again, it will work again.
Another answer stated that once it is exposed to air while plugged in, it will not work again.
Can you please clarify how the safety-shut off feature works?
Under what conditions does it shut off (if it overheats, if it runs dry, if it gets below some minimum water level, or all of the above?)
Under what conditions will it function again once this thermal switch has been triggered?
Also, how long is the 50 watt heater? I have a 10g marineland aquarium (part of the LED kit), and would prefer to keep the heater vertical.
Lastly, while I understand it is fully submersible, does it have to be fully submersed, or is there a minimum water line indicator on this model?
Thanks so much!
We have two different lines of heaters on the market. One is the Visi Therm and one is the Precision. The Visi Therm is the one that once it shuts off, will not come back on. The Precision has a new shut off that WILL come back on, once the heater has been re-submerged, and had time to cool down, and regulate itself.
Both shut off any time the water level drops below the minimum water level line on the heater.
The 50 watt heater will fit a 10 gallon tank just fine. It is 7-8 inches long.
Even though there is a minimum water line, we highly recommend that any of our heaters be fully submerged at all times.
Date published: 2016-02-04
what is meant by Precision Submersible heater?
i just bought a 200 watt Marineland precision submersible heater for my 50 gallon reef aquarium to replace a 20 watt completely submerged, horizontally mounted heater in the sump.
I am unclear about whether completely submersing the heater mounted in the sump is desirable
It can definitely be fully submerged, either horizonally or vertically. However, not in a sump, no. We do not recommend placing heaters in sumps for safety reasons. They tend to malfunction in that situation due to the fluctuating water levels.
Date published: 2016-02-03
Thermal fuse on the new Precision heaters.
The manual states that this new heater has a "resettable" thermal fuse to prevent overheating. And that once it is triggered should wait awhile for it to come back in operation. Does that mean this will protect the heater during those times we forget to unplug the heater during water changes? Is the glass resistant to temperature shock?
Yes, if you forget to unplug the heater and it becomes exposed during a water change, the fuse will shut it off. Once water covers it again, and the heater has had enough time to adjust, it will come back on. The glass is no more resistant to temperature shocks than any other normal glass.
Date published: 2016-01-25
I have bought multiple viso therm heaters along the years and I bought them because of the lifetime warranty but the stores would never take them back
So I don't know how to get them replaced or fixed?
Yes, that heater does indeed have a limited lifetime warranty on it. This means that for the life of that heater, if it fails, you simply send it back to us and we replace it for you. The stores do not honor the warranty, the manufacturer does. Once the heater has been replaced, your warranty is fulfilled and completed. Please call or email us directly for the address to ship the heaters to for your replacements.
Date published: 2016-01-20