Finnex HMO Heater w/ Digital LED Controller

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Quick Overview

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-50: 50W – 10-20 Gallon tank

HMO-100: 100W – 20-30 Gallon tank

HMO-150: 150W – 30-60 Gallon tank

HMO-200: 200W – 60-80 Gallon tank

HMO-300: 300W – 80-100 Gallon tank

  • Quick Overview

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-50: 50W – 10-20 Gallon tank
HMO-100: 100W – 20-30 Gallon tank
HMO-150: 150W – 30-60 Gallon tank
HMO-200: 200W – 60-80 Gallon tank
HMO-300: 300W – 80-100 Gallon tank More

Finnex HMO Heater w/ Digital LED Controller

86% Recommend this to a friend (89 of 103)

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HMO-50 Finnex Heater
SKU: 300120
Earn 32 Reward Points
HMO-100 Finnex Heater
SKU: 300121
Earn 34 Reward Points
HMO-150 Finnex Heater
SKU: 300122
Earn 36 Reward Points
HMO-200 Finnex Heater
SKU: 300123
Earn 38 Reward Points
HMO-300 Finnex Heater
SKU: 300124
Earn 41 Reward Points

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Product Questions

How long is the 300W heater?
Question by: Bill Peterson on Aug 21, 2015 4:14:00 PM
Great question!
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!
Answer by: Connor (Admin) on Aug 24, 2015 2:24:00 PM
Question by: PRESTON on Oct 1, 2013 9:13:00 AM
For a 60g tank we would suggest using the 200w heater. Its best to err on the larger size in case you need it (say you have a particularly chilly day).
Answer by: Bulk Reef Supply on Oct 1, 2013 9:13:00 AM
Do have a controller that controls both the heater and the chiller ??
Question by: ed Secula on Oct 7, 2013 11:38:00 AM
Hey Ed,
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.
Answer by: Bulk Reef Supply on Oct 7, 2013 11:38:00 AM

Full Details

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 start up. Please note that the digital display reads in Fahrenheit.


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  • Average By Kev on 8/2/2015

    Suction cups for holding heater in place do not do the job at all.
  • Great Heater By Donna on 7/19/2015

    I'm really impressed with this heater. I've been using it for about 3 months now and it doesn't miss a beat. Just set it & forget it, no more temperature swings. Also love the fact that you can adjust it without getting your hands wet.
  • Great Heater By Kristoffer on 5/28/2015

    I have gone through about a half dozen different heaters on both my 75g reef and 20g reef. This heater is by far the most reliable and consistent heater I have owned. It always maintains water temp with a +/- of 1 degree. I absolutely love this product..
  • 300W of power By Terri on 5/4/2015

    The 300w has changed-there is no separate temp probe, it is now located on the unit. The older model worked fine keeping the temp stable so I will need to see how this new method works. So far, the temp is rock solid. I like these heaters because of the ease of setting the temp and there is no glass to break.
  • The best heater I have used! By Alex on 5/4/2015

    I love these heaters, I have now bought 4 for different tanks and want to get them for the rest of my tanks too... They have a digital readout at all times telling you the current temperature. You set the temp you want it at and it automatically keeps it there, you know when it's on because a red light lights up. The other thing is they are not glass and feel so much sturdier than glass ones. I will only use these from now on, live it!!!
  • Dangerous By Kevin on 4/15/2015

    Two out of three went bad. I went to clean the inside of my tank and got a nice little zap I unplugged the heaters one at a time and then tried them all individually two shocked me.
  • Easy to program By Vladimir on 4/12/2015

    Had this heater for about a week now. Have inside my brute can curing some rocks. Holds temperature pretty well.
  • Never will buy another Finnex product By Furcifer on 4/5/2015

    #1 After owning the HMO-200 heater for 2 months the instructions got wet. I threw them away. I then looked on the Finnex website for a set of printable instructions and to my dismay, they have none. They have no instructions for any of their products. I then contacted them in regards to getting a PDF or a set of txt instructions that I could print. They would/could not provide me with a set of instructions. I really could not understand why a company would not list a set of instructions on their website. Cobalt/Eheim/Aquavia all list instructions on their sites.

    #2 After 5 months of use, I noticed that it was no longer holding to the stated +/-2 degree threshold. One day it would be 72 degrees then the next it would be 81 degrees. I contacted them about this issue. It took them 2 weeks to reply to my RMA request, and they asked a bunch of questions like, Did I try it in a different outlet? Was it hooked to a GFCI outlet? Did I recently have a power outage or power surge?, I answered all of their questions over the course of a week. They then asked me to send it to them. I sent it USPS Priority Mail. It cost $14. A week after they received the heater, I got a reply from them stating that the heater was no longer under warranty. If I would like the heater back, I would have to send them $22 for postage. I explained that the heater was malfunctioning during the warranty period and I contacted them prior to the warranty expiration date. I will never purchase another Finnex product again. Their measly 180 day warranty speaks volumes about how much faith they have in their products. Especially since companies like Cobalt Aquatics and Eheim all have 3 year warranties on their heaters.
    From their website:
    Products are warranted by JSK Merchandising Inc. To the original purchaser against defective material and workmanship under normal use for a period of 180 days from the date of the original purchase.
  • Great So Far By WLR on 3/6/2015

    Heater has been installed for about two weeks and has held the set temperature fine. Unit appears to be calibrated correctly as I have checked it against a glass thermometer. If the unit has any issues I will update the review to let others know my experience. Right now though its rocking!
  • Great Heater for this Newbie By Whitney on 2/4/2015

    I purchased this one because of its all-in-one capability, i.e. the digital reader attached to the heater. After the initial beeping of the digital reader because my water was cooler than 64 degrees, it has been perfect! I would purchase another one for sure.
  • Good Solid Product By Bob on 2/2/2015

    Very Easy and Simple to configure and install --- consistent temperature -- will be purchasing more in the future.
  • Great Product By Michael on 1/7/2015

    This heater seems to be much more consistent than the glass heater I use on my freshwater setup and the digital display makes getting the temperature set very easy. I have 2, one is off by 2 degrees and the other by 1 degree, but the product description does say it's accurate to +/- 2 degrees. Easy enough to adjust once you know how accurate the one you get truly is.

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