Eheim Classic 250 External Aquarium Canister Filter

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Put cleanliness first and protect your tank with the Classic 250 External Aquarium Canister Filter from Eheim. With this exceptional filtration system, you'll get both mechanical and biological purification, constant water circulation and oxygen enrichment in one compact system. It's tested to ensure optimum efficiency! Already equipped with everything you need to get started—including detailed instructions—the Eheim Classic is one filter that gets the job done.

Key Benefits
  • Offers both mechanical and biological filtration for a superior clean.
  • Promotes constant water circulation and helps to enhance your tank's oxygen exchange.
  • Includes filter media and valves.
  • Also comes with multiple accessories such as spray bar, inlet pipe, hose and installation equipment.
  • The pump head is made with a permo-elastic silicon ring to ensure it's closed properly after cleaning.

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  • Item Number
  • Dimensions
    6.29 x 6.29 x 13.97 inches
  • Aquarium Type
    Freshwater, Saltwater
  • Fish Type
    Tropical Freshwater
  • Material

Servicing and maintenance:

Pull out mains plug. Release locking piece on pump head and remove pump parts as per drawing. Lift out cooling channel insert with screwdriver. Clean all parts and then reassemble in the reverse order.

Note: All hose connections must be checked at regular intervals for correct fitting.


Why is the circulation performance of my external filter reducing?

The output reduction of your external filter is most probably not a failure of your appliance.

This type of pump system is based on the synchronous motor principle. This means that the impeller rotates at 3000 rpm. synchronised with the frequency of the mains supply or it is idle.

Even, for example, fluctuations in the voltage will not affect the revolutions. Due to the constant revolutions, the pump system always gives the same performance.

We must differentiate between pump output and circulation performance. Unlike the constant pump output, the circulation performance of the filter declines, as it becomes more contaminated. The running noise can become louder with increased contamination of the filter.

The reduction in circulation performance is, from our experience, generally due to:

  1. dirty filter media
  2. incorrect filter layer set-up
  3. hose set-up or other accessories set-up
  4. contamination in the hose set-up and in the pump chamber
  5. incorrect filter start-up

We recommend that you take the following measures to guarantee optimum, trouble-free filter operation:

  1. Clean the filter media. Remove the filter media from the filter basket and rinse them through in lukewarm water. Depending on the model, fine filter pads and filter wool must be changed with each filter cleaning.
  2. Check that your filter layering set-up is done according to our recommendations, see
  3. Check the hose set-up for possible kinks or restrictions
  4. Clean the whole hose installation regularly. Clean the inside of the inlet, the outlet as well as the inlet tube, spray bar and the hose connectors on the filter (adapter, shut-off taps) several times in a push-pull motion using an EHEIM Universal Cleaning Brush No. 4005570. Another important task is the regular cleaning of the pump chamber, as well as the cooling and grease channel, with the EHEIM Brush Cleaning Set No. 4009560 (see instruction manual on maintenance and care).
  5. Start up the filter by priming, (see instruction manual). Please take care, that the water outlet (pressure side “OUT”) is situated above the water surface level during filing. This is the optimum way to avoid air entrapment in the filter.

How often should an external filter be cleaned?

There are no fast rules for this, because there are too many factors which influence the cleaning intervals, such as size of aquarium, fish stocking, type of plants as well as type and quantity of food. We therefore recommend that you only clean the filter when the pump output noticeably decreases.

A period of 8 weeks between cleaning should, however, be possible; with shorter cleaning intervals bacterial activity will suffer.

Rating: 4.3 of 5 stars 8 Reviews 8 Reviews 4.4 out of 5 Stars

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88% Recommend

88% of reviewersrecommend this product

Rating: 4.3 of 5 stars 4.4 / 5

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  • 5 out of 5 stars

    german engineering

    By richard on Oct 24, 2021

    my first canister filter purchase and i'm extremely disappointed that i waited as long as i did!.. I should have purchased an eheim canister years ago!!. I love this thing and i will be buying another!. This model comes with enough media to fill 3 aqua110s and it's virtually silent running. All the hose you need/spray bar/shut off valves/and it's a breeze to set up..

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  • 5 out of 5 stars

    Best In The Business for Freshwater Aqarium

    By AquariumProfessional on Sep 29, 2021

    I service Aquariums for a living and the Eheim Classic is the best Canister Filter in the business. There are fancier units from other manufacturers, but they are either complex to use, have problems sealing properly or simply don’t filter well. Also, if your Eheim breaks, the parts are easily replaceable, such as the impellers or impeller ceramic rods. I use these mainly on freshwater aquariums. However, you can also use them on fish-only saltwater aquariums or as supplemental filtration in addition to ur sump on reef tanks to run carbon or other filter media.

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  • 5 out of 5 stars

    Eheim 2215

    By MLClark on Jun 30, 2021

    Eheim uses old engineering that just works, tried and true. It comes with great filter media. Easy to clean once a month.

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  • 5 out of 5 stars

    Cantainer filters

    By noah on Jul 3, 2021

    These is the best i Owen a few of them but i use theses only for bio and i clean them every 6months

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  • 4 out of 5 stars

    Pump Works as advertised

    By FishOwner on Sep 27, 2020

    I have 1 large gold fish and his tank was always cloudy but with this filter the water is becoming clearer. Directions for setting up this pump are pretty sparse suggest you search YouTube for examples to set up pump.

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  • 2 out of 5 stars

    Was great until it broke

    By Shannon on May 24, 2020

    I was so happy with this filter. It made my life easier and the water was in great shape. Then, just into it's second year, it up and died. Dead as a doornail. Now I have a pump to throw away and went back to my indestructible Marineland pump/filters.

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  • 5 out of 5 stars

    Chewy is the best

    By Karen on Aug 17, 2019

    The Eheim filter arrived in perfect condition, quickly and at a very good price. Chewy is the best!

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  • 4 out of 5 stars

    Great filter but terrible factory packing job.

    By BobG on Apr 19, 2019

    The Eheim classics are great filters and they last for years. However it was badly overstuffed with media at the factory to the point where it actually broke the cover of the media cannister.

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