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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.
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!
Horrible Heater DO NOT BUY By dwayne on 12/14/2016dwayne wouldn't recommend this product to a friendBought the 300W for my 75 G reef tank, installed last night only to wake up to a very cold tank. Checked the controller, saying it 78 degree when my apex as well as my other temp probe confirming it is 75 degree. Set the temp controller on the heater to 92, Heater still shut off. Returning this piece of crap. Going back to Aqueon Pro Heaters
Do not Buy By John on 11/5/2016John wouldn't recommend this product to a friendI wish i would have read a couple of reviews before i bought these heaters and BRS should remove them from their website. I have them connected to a reefkeeper lite and they can't hold the 78 degree temperature. I have both units set at 92 so that they stay on all the time but they shut off all the time and say the temperature in the tank is 88 on one and 92 on another. when the reefkeepeer keeps them on because they can't hit the temperature. Very disappointed.
Good heater, but don't trust built in controller By Nick on 9/29/2016Nick would recommend this product to a friendThe unit seems to be made of quality materials, but the controller isn't to be trusted. I'm using a Reefkeeper Lite to keep my tank stable, so it's not an issue for me. When used without a separate controller, the heater can't keep a stable temperature. It fluctuated about 5 degrees when using its built in controller.
Great Product By Harry on 8/1/2016Harry wouldn't recommend this product to a friendWorks consistently and accurately. Thanks.
Excellent product! By Carmen on 6/29/2016Carmen would recommend this product to a friendThis was the easiest heater to set temp to. I got the 300 watt and it's not overly big. Smaller than another name brand heater it replaced.
Awesome By FLSharkvictim on 5/29/2016FLSharkvictim would recommend this product to a friendGreat heater for under the $50.00 range.. The thermostat that is build in is dead on with my with my temp controller.. HIGHLY recommended...