Works but... By Helen on 1/28/2016
Helen would recommend this product to a friend
I have this heater on a 55 gallon display with a 240 gallon sump (yeah I know...serious overkill). Originally I had a 265 gallon display but when the bottom fell out, the 55 was pressed into service. My tanks are in a converted garage that we euphemistically call the family room. It is very cold in there in the winter. This heater keeps the water warm nicely. My only concern is that it never seems to shut off. Would I recommend it? Time will tell.
not happy with customer service of Eheim products By Frenchy on 11/12/2015
Frenchy wouldn't recommend this product to a friend
the heater is not working good, from day one, it's always on. But the problem it's that I called Eheim customer service and I tried about 4 times and every times that you're supposed to get thru and talked to someone, they send you to a voice mail, and you leave a message but they do not have the decency to return your calls. Eheim it's not worth a penny
Rock solid product By Adam on 9/5/2015
Adam would recommend this product to a friend
These heaters work amazingly well and the built-in controller is really pretty good at not bouncing on the threshold all day (which shortens the life of the unit). I have double insurance in place with these plugged into my Apex, but could not be happier with the high quality of these heaters.
Great for the Price By Sterling on 7/23/2015
Sterling would recommend this product to a friend
Luckily this heater is able to be calibrated. After watching it closely for a few days, calibrating accordingly, it heats to the correct temperature and keeps it that way.
The only one I use... By Evan on 7/18/2015
Evan would recommend this product to a friend
The Eheim heaters are the only ones I use nowadays, from freshwater and reef tanks to quarantine and mixing the bucket. I've never had a break or failure.
One word of caution: make sure you check the size before you buy! I've found these tend to run a bit large for the wattage compared to other brands.
Great Heater By Mark on 5/3/2015
Mark would recommend this product to a friend
Bought a heater from a big box pet store to get my by while I waited for my Eheim heater to come in. The other heater I could never get to balance properly however the Eheim after one calibration is spot on and works like a charm. Thanks Eheim for making a quality product.
Perfect By Joshua on 4/25/2015
Joshua would recommend this product to a friend
have this on my saltmix tank so temp is perfect to my display makes for fast and easy water change without having to wait for temp to equal works great
Not the eheim I remember.. By Wylderhoads on 4/4/2015
Wylderhoads wouldn't recommend this product to a friend
I bought 2 of these 100 watters for my sump. I've always used eheim products, but this time was different. My DP was at 79F when I put the heaters in, both set to 77 on their thermostats, and they both turned on (actively heating) when I plugged them in. An hour later, they were STILL on heating the water to around 85F. So, it seems like the thermostat in BOTH of them just doesn't work. I bought a finnex heater and synced it up to an apex controller, and will never look back.
Heats well By Martha on 3/29/2015
Martha would recommend this product to a friend
This was a reasonably priced heater, purchased for my 180 gallon aquarium. It does heat well, however we do spend a lot of time watching and adjusting the heat. We do have it on a timer as well.
good heater By aquanut on 3/14/2015
aquanut would recommend this product to a friend
Quality heater at a reasonable price.