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Finnex HMO Heater w/ Digital LCD Controller (DISCONTINUED)

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Finnex

HMO Heater w/ Digital LCD Controller (DISCONTINUED)

77% Recommend this to a friend (121 of 158)

158 Reviews

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Maintain temperature control to provide a safe and stable environment for your tank inhabitants with the Finnex HMO Titatium Digital Control Heater.

Digital accuracy within to +/-2°F keeps water temperatures at a constant level.

HMO-100: 100W – 20-30 Gallon tank - 6.7" Long
HMO-200: 200W – 60-80 Gallon tank - 10.6" Long
HMO-300: 300W – 80-100 Gallon tank - 11.9" Long

Finnex Digital Titanium Heaters implements new technology for precision digital control for maintaining water temperatures at a constant level. The titanium tubes are corrosion-resistant and virtually unbreakable. These advanced heaters create a safe, healthy, and stable temperature by maintaining water temperatures within +/-2° F of the set value for your tank. Additionally, Finnex HPS heaters are equipped with memory. so in the event there is a power outage, your heater will resume your preset temperature settings at startup up.

Please note that the digital LCD display reads in Fahrenheit.

Items 1 to 12 of 158 total

View 12 / 24 / 48

Calibration needed but it is consistent. By Chris on 12/17/2019

Chris wouldn't recommend this product to a friend

I’ve had this for a few weeks now and I am having the same issue as everyone else. I have to set controller at 81 degrees to get a reading of 78 in the tank. But at least it does keep a consistent temperature. I wouldn’t buy this again.
Only buy the 300W - the other watts are different By JP on 5/15/2019

JP would recommend this product to a friend

I've been using these Finnex HMO models for years. I own the 150, 200 and 300W versions. I'd ONLY buy from here on out the 300W as it has a separate temp probe. The other models have the temp sensor built into the heater and just don't work very well. BUY Yourself a "TAILOR" digital kitchen temp probe. You need one anyway for meat, calibrate it (with icewater.) and then use it to know how far off your Finnex is from reality. Most are going to be ~3deg off. I've found that these Finnex ise one of the best in the price range for holding temp. That they hold within a .5 degree range. Most give negative reviews as the temp is so far off, yet with a good method of calibration I feel these things are the best value heater on the market.
Miscalibrated by 6 degrees By Jason on 4/29/2019

Jason wouldn't recommend this product to a friend

I used this heater for about 4 months before realizing that it measured 6 degrees higher than the actual temperature of the water. Thanks to this heater, my tank was 73 degrees instead of 79 until I bought a thermostat to set up some cooling fans with and noticed it measured 6 degrees lower. To figure out which was wrong, I bought another temperature sensor and it agreed with the thermostat to the 0.1, proving that this heater was horribly miscalibrated. I will never buy a finnex product again.
Do Not Buy - Horribly Off By Jon on 3/24/2019

Jon wouldn't recommend this product to a friend

I bought two of them to heat water for my water changes. I wish I could give it zero stars. I noticed they were definitely reading wrong to begin with when I put them in the water. When the water hit 78.6 I had one of them set to the highest possible temperature of 92 (that one took about 2-3 seconds to go up a degree, ha). The other one I had to set to 88 to get 78 degree water. Can't trust them at all even for water changes, and I would never ever put one in my tank.
Better than others By Brook on 3/4/2019

Brook would recommend this product to a friend

I went the next size up than recommend for my tank. Heater does good and only a half degree swing on each side. How ever as other mention the temp showing is 3-4 degrees higher than actually tank temp. Tank runs around 78 when controller shows 81. If off this much I would assume over time it could swing more. Does take about 48 hours to find its stable point from initial setup. I would recommend to not OVER work this heater. Titaniums are known for failures if you purchase too small of a heater.
Good Heaters - quality product - Trusted By Dmize on 1/1/2019

Dmize would recommend this product to a friend

These heaters are pretty nice. They are made of good quality materials. I do wish the heaters digital controller would be a little nicer but, overall the package is nice. I run 2 of the 200W ones in my 150G system. I have a temp window of 78-79 controlled with my Apex and they heat up the tank super quick. 4 Stars because one failed after 1 year. Just purchased a replacement for it same model. I trust these heaters.
Easy use By Bow69 on 9/8/2018

Bow69 would recommend this product to a friend

Seems to heat consistently. Had to set the controller at 82f to get a tank temp of 78f.
Could be good bue terrible By Andrew on 3/14/2018

Andrew wouldn't recommend this product to a friend

Does Finnex even have quality control? Apparently not. As mentioned in many reviews the thermometer device within this unit is atrocious. I have it set on max temp somewhere around 95 degrees and somewhere around 77.5 degrees actual water temp (verified +/- .5 or so through various thermometer devices) the heater registers 95 and will not send power to the heating element. I choose to use units with an independent thermometer control in the case that there is a temp probe malfunction with the Apex unit. Well this piece of crap will not function above 78 degrees and I prefer to run 78-79.
Good only if you use with Apex/Reefkeeper By Aquanaut on 2/19/2018

Aquanaut would recommend this product to a friend

The heater part is well made, but as others have said the temp settings and readings are garbage. Mine reads 5 deg F higher than the tank. Without an external controller such as the Reefkeeper (what I use) or Apex I would not use this. With the controller it is good my temps are constantly 77.4-77.5
Do not buy this heater By Jim on 2/11/2018

Jim wouldn't recommend this product to a friend

I read the reviews and got 2 anyway. The temp probe is part of the heating element housing and it tries to "estimate" the temperature which in my case reads from 80-84 degrees when it is actually about 78. I don't mind it reading high but it wanders over 4 degrees with the water temp being consistent. I checked it with a recently purchased calibrated thermometer while mixing water in a trash can.
Using it with an Apex controller I had to set the temp at 85 for it to consistently stay on with the Apex programmed with 78.3 and 78.5 range.

The problem is the location of the temp probe (built in to the heater housing) and the "estimating" the heater does to try and read the temp of the surrounding water.

I really like the ViaAqua heaters, wish BRS carried them. I just replaced 2 in my tank, one for 3 1/2 years. I have purchased 2 new ones and the Finnex heaters are in the trash.
Not too happy with my purchase of HMO-200 Finnex Heater By Michael on 1/20/2018

Michael wouldn't recommend this product to a friend

I am NOT happy with my purchase, PLEASE believe the reviews about the heater, the controller is set at 82F and the water in a 30 gallon system is 78.6F. Purchase a Neo-Therm if you need something under 150w.
I am in the process of replacing the Finnex with a 150w Neo-Therm, personally I should have believed the reviews.
Calibration is non existant By Chris on 1/19/2018

Chris wouldn't recommend this product to a friend

I thought I was buying a good heater but I put my hand in the tank today and realized it's pretty cold so I set up three different thermometers in my tank and all three were reading in the 73 range while the heater was set at 78 and not even heating. I guess I'll have to boost it up to get all the thermometers reading 78. My poor livestock!

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The BRS team will respond to your question as soon as possible. The best questions will be shared on this page to help other reefers in the future.

What is the length of the 150w?

Question posted on Apr 22, 2016 4:32:00 PM

Great question!
The length is 7.8" you will need 9" of clearance to handle the cable from the top.

Answer by: Connor (Admin) on Apr 26, 2016 6:45:00 PM

Finnex

HMO Heater w/ Digital LCD Controller (DISCONTINUED)

Calibration needed but it is consistent. By Chris on 12/17/2019

Only buy the 300W - the other watts are different By JP on 5/15/2019

Miscalibrated by 6 degrees By Jason on 4/29/2019

Do Not Buy - Horribly Off By Jon on 3/24/2019

Better than others By Brook on 3/4/2019

Good Heaters - quality product - Trusted By Dmize on 1/1/2019

Easy use By Bow69 on 9/8/2018

Could be good bue terrible By Andrew on 3/14/2018

Good only if you use with Apex/Reefkeeper By Aquanaut on 2/19/2018

Do not buy this heater By Jim on 2/11/2018

Not too happy with my purchase of HMO-200 Finnex Heater By Michael on 1/20/2018

Calibration is non existant By Chris on 1/19/2018

What is the length of the 150w?

Would 2 HMO-200 Finnex Heaters work for a 120 gallon reef tank?

How long is the 100w? Would it fit in the back of an Innovative Marine Nuvo 20?

How long is the 200W heater?

I have 150 gal salt water can i use 2 finnex 300 digital control hmo heaters

Would 2 300w heaters work in a 215g? I figure with the rocks it prob. more like 200g of water? Also, can I lay them down flat on the bottom of the sump?

How much clearence does the 200w heater need? My sump is only 12" wide

Can the Finnex HMO be mounted in the tank vertically, or is horizontal mounting the only option?

How long is the 300W heater?

Are the finnex heaters grounded, do they have a three pronged plug?

I have 220 gal aqurium . Will 2 300 watt heater be enough ?

Are these submersible...also what is the length of the 150 watt

I am starting a 55 gallon salt water. If I add a protein skimmer what size would I need? If I dont add the skimmer will the size suggested be to much?

IF MY TANK IS 60 GALLONS WOULD YOU RECOMMEND THE HMO-150 OR HMO-200?

Hello, I have a 15 gallon and 20 gallon tanks. Im thinking of getting the 50 watt for the 15 gallon but what should I get the 50 watt or 100 watt for the 20 gallon tank? Thank you -Paul

What size would you recommend for a 29 Gallon JBJ Nano Cube? And more importantly, will it fit in the back?? Thanks!

Do have a controller that controls both the heater and the chiller ??

What size would you recommend for a 29 Gallon JBJ Nano Cube? And more importantly, will it fit in the back??
Thanks!