Comments: This product works like a charm. It keeps the water at a nearly constant temperature, has a good flow rate and was easy to set up. I purchased this product when my old Fluval filter finally broke. What a difference. The Eheim is easier to set up, clean, doesn't have problems with the O ring seal, and keeps the water at a constant temperature without having to use an ugly in tank heater. Good job Eheim.

Comments: Before buying this one, for more money than the 2026, I had read 1 review that the heater stopped working prematurely.
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<br />I figured that was just one unlucky buyer... but I was wrong.
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<br />I should have saved $80 and bought the 2026 without the heater as my 2126 heater stopped working at 2 months old.
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<br />Other than that, the filter is quiet and works well.

Comments: I had originally ordered the 2026 filter but it was damaged during shipment. I didn't notice it until after the installation when it leaked from the top filter unit. I tried to reorder the same model but was told by MD 2026 has been discontinued.
<br />The 2126 is the same as 2026 but with an internal heater. The unit runs very quiet and maintains the set temperature pretty well. I don't like the one piece intake and outlet pipes that came with 2126 compared to the sectional pipes in 2026. It does not offer the flexibility for various tank configurations. I ended up using an old outlet sectional pipe instead of using the one came with the unit. This is the main reason I am not giving it 5 stars. Overall this seems to be a good quality filter.

Comments: This is my third one, one for each tank. The filtering and heaters all work great. They cost more but are worth it. If there is a drawback it's the high cost of filter media. But most of it can be used over and over.

Comments: Easy to use and great build quality. Thermostat is accurate too (I confirm with another thermometer). Super easy to open and clean and I never get drips when I disconnect the hoses.

Comments: I have had Eheim filters for years. They work great.
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<br />However avoid the thermofilters. My temperature controller started going wacky after two years. I had to dicsonnect it and go to an external unit.
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<br />Save money and get the 2026 unit. An buy an external heater !!!
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<br />I still love the filter !

Comments: I like Eheim filters based on experience they are very reliable and provide a nice clean installation. This filter works as advertised but I would have liked an indicator on the unit denoting the heater is active as well as a smaller probe or internal sensor for the temp. One of the reasons I bought the thermofilter was to get the heater out of the tank. It does that but you have to place a probe in the tank for temp display.