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The length is 7.8" you will need 9" of clearance to handle the cable from the top.
The 200w HMO heater is good for tanks around 60-80 gallons and two of them would be perfect for a 120 gallon tank. Thanks for the question and if you have any more just let us know.
The 100w model measures 6.6" long and would certainly fit in the Nuvo 20.
The 200 watt will be 11" long. Feel free to let us know if you have any further questions!
2x 300 watt heaters would be a perfect set up! Feel free to let us know if you have any further questions!
The HMO heaters can be mounted in any orientation and it shouldn't cause any issues.
Thanks for the question and if you have any more just let us know!
The Heater is 12" long exactly. However 13" clearance would be needed to fit with the chord coming out of the top of the heater. Feel free to let us know if you have any further questions!
You will need between 550-1000 Watts in your system. 2x 300 watt heaters would work well!
These are submersible and the cord from the wall to the controller is 4 feet and from the controller to the heater is 2 feet. Feel free to let us know if you have any further questions!
You can certainly select 2 heaters one which the controller set to a slightly lower temperature. For this size tank you will want 2.5-5 watts per gallon around 250 watt total. Here you could select 2 150 watt heaters to work well and place in the same section of the sump if needed!
Typically you will want between 2.5 watt to 5 watts per gallon. Ideally the 100 watt will work great with the 20 gallon tank. Feel free to let us know if you have any further questions!
You will want 100 watt heater for best performance. These will sit in the back no problem. Feel free to let us know if you have any further questions!
Lastly, what would you recommend for a 29 Gallon JBJ Nano Cube and would it fit in the back of the filter area?
For the initial set up 2x 300watt heaters would work out great! The controller is the part which turns on or off depending on temp in the water column. For a 29 gallon tank we recommend anywhere from 75-150 depending on room temperature. usually 75 watt is plenty. Feel free to let us know if you have any further questions!
For something like that you would be best served by an aquarium controller. The most basic of which is the Reef Keeper Lite unit and it will do both of those things as well as give you two more outlets you can use as timers or other functions.
Not calibrated By Scott on 9/7/2017Scott wouldn't recommend this product to a friendI have had this heater in service for a couple of months now, and the temperature is consistently 2 degrees lower than it reads. It seems to keep a consistent temp at the setting, just 2 degrees low. Will be looking at other options.
Not calibrated from factory correctly By Robert on 7/26/2017Robert wouldn't recommend this product to a friendIt's about 5 degrees off. I have 3 thermometers that are all within 1 degree of each other. They all show 79 while this thing shows 84. I'm trying to start up a new tank here but I don't really trust this heater. I'll keep an eye on it while the tank cycles. I'll just have to set it 5 degrees high but Definitely not putting any fish in until I'm sure this works.
Mediocre Heater with Terrible Warranty Period By Logan on 7/14/2017Logan wouldn't recommend this product to a friendBought two, have to keep both set at 84 to keep the water at 78 since the heating element and probe are not well isolated.
Then 10 months after purchase one died, and the warranty is only 6 months. I'd expect at least a year warranty on something like this.
Great control By Oranin on 7/3/2017Oranin would recommend this product to a friendI like this heater because it will not shatter with glass. Also the controls are easy to read and set. It’s reliable and fits in the back chamber of an AIO.
I dislike the hook attachment to hang the temp reader because it was easily lost and now I just free hangs
Good Little Heater By Jeffrey on 5/27/2017Jeffrey would recommend this product to a friendWorks good for me. Have had the 200w for over a year no problems. Just got the 300w for my new tank and like the small size for a 300w heater.
great product By drobart on 5/18/2017drobart would recommend this product to a friendI own several of these 300 w units, the first one lasted about a year, the second and third one are still going strong, still working after 2 years, I did just purchase a new 300 w unit and was impressed with the new style heater, the temperature line is now combine within the unit instead of a second line running off of the unit. more stable.
Failed after 1 year By Ed on 4/9/2017Ed wouldn't recommend this product to a friendAlmost 1 year to the day after installation the heater failed. The warranty is 6 months. My expectation would be this product would last longer than a year and the warranty should be at least that long.
Inexpensive and worked well. By Loren on 4/1/2017Loren would recommend this product to a friendI bought this item for a small isolation tank. I had another brand heater without a control which was supposed to keep the aquarium at 78; but it kept it between 80 and 81.5. This is too hot for me. So I bought this. I set it at 77 degrees and it keeps the tank between 76.1 and 76.3, which is where I want it (I have a good reference thermometer). This is perfect with little variation. I know these have some negative review, but I have had good luck with it.
Great heater By Mark on 3/24/2017Mark would recommend this product to a friendI've have had this 300 watt Finnex HMO heater in my tank for over 3 years and it has kept my tank at 80.5 degrees since day 1
One Month By Grink on 2/6/2017Grink wouldn't recommend this product to a friendCeased to operate after only one month of use.
Both failed By John on 1/22/2017John wouldn't recommend this product to a friendWithin the first year both heaters failed. Luckily I had a Reefkeeper plus that alerted me to the failure.
JUST NO By Junbin on 1/8/2017Junbin wouldn't recommend this product to a friendDo not buy this heater, this heater doesn't stay at desired temperature! Trust me!