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The HMX-s heaters cannot be calibrated, however if you ever do notice their temperature is off, just use it as a reference. In all honesty depending on what your reference for temperature is, the heaters are usually pretty accurate within a degree or two.
Lastly, is the display pad waterproof?
The Display will be used to set the ideal temp, after a few seconds it will display the actual tank temperature. The display will be +- 2 degrees. Teh display is not water proof and will need to be placed with care. This is slightly water resistant but not proof.
This will have a plastic cover and may be able to prevent small splashes however this is not designed to be water resistant and if water is left on it or creeps through the connection will cause damage.
we recommend 2.5-5 watts per gallons. 250-500 watt heater depending on the background temperature of the room.
Finnex HMX-S heaters come with an attached digital, touchpad controller that will allow you to precisely set the temperature within your aquarium. These heaters are great for fresh or saltwater aquariums that require a stable, and safe heating system. The HMX-S heaters will keep the temperature within a range of +/- 2 degrees from the set point and with the heating indicating LED you will know when the heater is producing heat or not. Additionally, Finnex digital 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.
Finnex HMX-S Heater Comparison Chart
|Model||Wattage||Amp||Control Range||Tank Size||Overall Length|
|HMX-S 50||50||.45||68 - 92 degrees||5 - 20 gal||5.75 inch|
|HMX-S 100||100||.9||68 - 92 degrees||21 - 30 gal||6.75 inch|
|HMX-S 150||150||1.35||68 - 92 degrees||31 - 60 gal||8.0 inch|
|HMX-S 200||200||1.8||68 - 92 degrees||61 - 80 gal||10.75 inch|
|HMX-S 300||300||2.7||68 - 92 degrees||81 - 100 gal||12.0 inch|
|HMX-S 500||500||4.5||68 - 92 degrees||101 - 120 gal||15 inch|
Internal Duty Cycle By Carl on 2/25/2017Carl wouldn't recommend this product to a friendLike others have stated, I too have a 2-3 degree difference between tank temp and heater set temp. I called Finnex and was told that the 150 watt heater is not big enough for an open top 40 gallon tank. After plugging it in to an Apex and manually selecting the outlet on, I can see from the current draw that this heater turns on and off on its own every couple of minutes. It looks like the heater actually heats maybe 50% of the time.
It takes several hours to heat a 5 gallon bucket of water from 60 to 75 degrees. So, overall.. if you do buy this heater make sure it is way oversized for the application.
Junk By spiraling on 2/20/2017spiraling wouldn't recommend this product to a friendI bought 3 of these at the Back Friday sale. Just now setting up the tank. I've used several brands of heaters and wanted to try the finnex titanium. The first heater fried the controller within 1 minute. The second heater is over 4 degrees off. The cord from the heater to the controller is pretty short so its hard to get it away from water, but the controller does not look at all water proof, and that is unacceptable around a tank. Complete waste of money. I'll get something better for my reef.
Do not buy By Edward on 2/11/2017Edward wouldn't recommend this product to a friendI read good things about Finnex, but this model is junk. The thermostat doesn't seem to work. It stays between 78-79, but my Apex says 74-77. So it is up to 4 degrees off, but also, when the Apex thinks that temp goes up 3 degrees, the Finnex thinks it has only gone up one degree. My tank buddy bought the same heater and had the same problems. Now, I see the reviews about this model and wish I had done a little more research.
6* difference By Mark on 1/31/2017Mark wouldn't recommend this product to a friendI was hopeing this would be a good heater. Unfortunately the other reviews show the same results I am experiencing. The digital readout says 82* but the actual tank water is 76*. Not accurate to the +\-2* as stated. I will be looking for a different heater
Very inaccurate By Reefya on 1/21/2017Reefya wouldn't recommend this product to a friendDoes not read proper temp in the desplay luckily I had it plugged into my aquarium controler.
Not accurate By Kyle on 1/4/2017Kyle wouldn't recommend this product to a friendHave this heater in a 40 Nuvo in the second chamber and the temp display I have set at 78 but after putting in a thermometer in the tank it only reads 73. So all and all the heater is off by 4 degrees. And I bought it on Black Friday about one month old this is unacceptable. Also the cord from the display to heater is not long enough to at all. gave it 2 stars cause it looks nice and turns on that's about it
Innacurate By Peter on 11/29/2016Peter wouldn't recommend this product to a friendNice looking unit but thermostat reads about 4 degrees too high when the heater is on. I guess the heating element is impacting an internal temperature sensor. Placing the heater in area with substantial water flow -- next to return pump in sump -- did not help. I have replaced this unit with a Finnex heater that does not include a thermostat, and a separate Finnex thermostat-controller that has a temperature probe at end of a wire so it can be placed far from the heater. That setup is working great.
Unreliable so far By Jeff on 11/24/2016Jeff wouldn't recommend this product to a friendThis heater looks nice and looks like it was money well spent but I placed the heater tube horizontally in the bottom of sump and placed the led display on the front face of sump and turned it to 80*. This was aroundone 5pm the evening I got the heater. The next morning the temp in my water had dropped from 76.6* to 74.2*. The thermometer is reading higher than actual water temp. If I turn the display/controlder to 80 it jumps right up to 80 and drops to 79 heats back up to 80 and so on..if I turn it to 91 it jumps to 91 in about 5 minutes while actual water temp is 76ish. Just not happy at all with the heater
Very impressed By Dave on 11/15/2016Dave would recommend this product to a friendI have recently gotten back into the hobby after a long hiatus. I've had many tanks throughout the years and have found dual metal thermostats tend to fail on rather than off. I like the idea of a digital controller. I was a little skeptical buying this as I did so before there were any reviews on this, but it has turned out great. Also, much less expensive than a separate controller. This heater keeps the temperature to +/- .1 degree! I have an LCD thermometer with an alarm set to +/- 1 degree and have yet to have an alarm.
Good product, Worth the money By DavidTag on 11/2/2016DavidTag would recommend this product to a friendI bought this heater after my cheap (not even sure of make/model anymore) saltwater heater broke. It is very easy to use and seems to have a pretty accurate thermostat. In my opinion the best part is that the heater controller does NOT lose the settings if unplugged. This is essential when using with a controller like Apex (what I use) which turns power on and off to equipment. I bought the 100W version and it does a good job keeping a constant temperature, even prior to me installing the Apex controller. The instructions say to mount it horizontally, I guess because of the location of the thermometer on the heating element, but I didn't have space so I mounted it vertically. that doesn't seem to make a major difference as long as it has steady flow (in sump where water flows constantly. The one con is that the cord isn't very long. Luckily I didn't need it to be.