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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.
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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...
Great heater, but integrated thermocouple causes issues. By FishersCoralReefFarm on 5/8/2016FishersCoralReefFarm would recommend this product to a friendI have two of these. 75@ with the separate thermal probe and a 300W with the integrated thermal probe.
I have the 300W heater on a 130-gal system with a 79-F set point. The water temperature of that system, as measured by a calibrated digital hand-held meter, reads 76-F when the Finnex controller displays 79.
If I unplug the Finnex heater for 15 minutes and plug it back it, the digital display shows a temperature of 76-F for about 30-45 seconds. But, after the heater has been on all that time, the digital display on the Finnex climbs and within 2-3 minutes reaches the 79-F set-point, at which time the heating element turns off. A sample of the water reads 76-F with the hand-held digital thermocouple.
I believe that by integrating the Finnex temperature sensor into the heater body itself, leads of a falsely elevated temperature. I can choose to simply raise the set-point of this heater to 82-F and cross-check with my hand-held, but I am taking a risk by relying on a temperature bias that might not be there one day.
I still recommend this heater for it stability, clean-ability, durability. But I am planning to by a separate external thermal controller . I believe this will work, as the Finnex retains its set-point during power loss. I’ll just have to get okay with the idea that every time the external controller turns on power to the heater I will hear a quiet beep.
HMO-300 Finnex Heater By RCM on 5/2/2016RCM would recommend this product to a friendBought the 300, I've had it only 3 weeks, no issues so far....
1st one was great. 2nd and 3rd sucked By Davo31 on 4/28/2016Davo31 wouldn't recommend this product to a friendI bought one of these a year ago and loved it so much I bought a back up a few months ago. The 2nd one wouldn't turn on so I got a replacement from brs. Then that one lasted 2-3 weeks before it quit...... And my original from a year ago finally gave out this morning. Im kinda thinking it's the LED portion breaking and not the heater itself. Each heater would get around 10 degrees off before it would just start flashing/ not turn on. Either way I will not be buying this brand again. And now I'm forced to buy a aqueon pro (it's too big for my liking) for Petco because I need a heater now.
Side note: BRS did an amazing job at customer service. There were some hiccups but they kept in contact with me and I'll definitely keep buying from them in the future
Excellent By Hoss on 4/14/2016Hoss would recommend this product to a friendI have been using 300 watt heater for four months in my 75 gallon reef tank. I keep it set at 79 degrees. It keeps the tank within a one degree range. The suction cups are not the best and I needed to add my own. The memory feature is nice. Overall very pleased with this product.
Finnex HMO Heater with Digital LED Controllre By Brian C. on 3/28/2016Brian C. would recommend this product to a friendI am using this product to heat my saltwater to be used in my tank. It works quickly and seems to be accurate on the temp it is heating to. I like its quality.
Good Product for the price By Chris on 3/24/2016Chris would recommend this product to a friendI have only had the heater now for about 1 month but overall it runs great. Good display with temperate gauge built into it allows you to set the temp to your desired temp and also see the current temp. It does seem to be off almost 2 degrees, but it holds a consistent heat for my 55 gallon tank. I run a 200 watt, and I would recommend it.
Great, consistent heater, nice digital display By Becky on 3/18/2016Becky would recommend this product to a friendNice sleek little heater, suction cups work nicely. I really like the digital display and it's little hook for hanging, however the cord between the heater and the display / controller could be longer to allow more placement options. Keeps a consistent temperature and seems to be durable.
Good product By jeremiah on 3/16/2016jeremiah would recommend this product to a friendI really like having the digital temp readout. I have been using this for about a month and have had no issues.