# What is the most energy-efficient aquarium filter available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the most energy-efficient aquarium filter available?

## Products

### Aqua Clear AquaClear Power Filter 70
```yaml
product: aqua-clear-aquaclear-power-filter-70
brand: Aqua Clear
price_gbp: 51.02
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1135 L/h
noise_level: null
filter_media_type: Foam, Activated Carbon, BioMax
maximum_tank_size: 70 US gal
energy_consumption: 6 W
filter_media_volume: null
```

- **Price:** £51.02 [^1]
- **Summary:** The AquaClear 70 is a hang-on-back power filter delivering up to 1135 L/h with adjustable flow control and multi-stage filtration using foam, activated carbon and BioMax. It's low-power (6 W), designed for aquariums up to 70 US gal, and focuses on biological, mechanical and chemical filtration with an easy-service media basket. Suits hobbyists needing reliable, quiet HOB filtration with customizable media.
- **Ideal For:** Suitable for the most energy-efficient aquarium filter search because it consumes only 6 W while providing up to 1135 L/h flow, giving high flow per watt.

### Aquael Ultramax 2000
```yaml
product: aquael-ultramax-2000
brand: Aquael
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 2000 L/H
noise_level: almost inaudible
filter_media_type: sponge, filter cloth, BioceraMax (starter media)
maximum_tank_size: 700 L
energy_consumption: 21.5 W
filter_media_volume: 10.1 L
```

- **Price:** £None [^2]
- **Summary:** Aquael Ultramax 2000 is a large-capacity canister filter with a 2000 L/H flow rate, five 1.9 L media baskets (total media capacity 10.1 L) and an integrated 0.6 L prefilter. It features self-priming, double ball valves for leak prevention, quiet operation and low power draw, making it suitable for large freshwater or marine aquariums up to 700 L. The unit is supplied with starter sponge and biological media.
- **Ideal For:** Ideal for energy-efficient filtration because it combines a high 2000 L/H flow with low power draw (21.5 W), giving excellent litres-per-watt performance.

### Eheim Eheim Classic 250 Canister Filter 2213
```yaml
product: eheim-eheim-classic-250-canister-filter-2213
brand: Eheim
price_gbp: 52.33
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 116 US gal/h
filter_media_type: coarse pad, fine pad, activated carbon, Substrat Pro, EHFimech
maximum_tank_size: 66 US gal
energy_consumption: 8 W
filter_media_volume: 0.80 US gal
```

- **Price:** £52.33 [^3]
- **Summary:** Compact external canister filter with a 116 US gal/h pump output, 0.80 US gal filter media volume and very low 8 W power draw. Includes coarse and fine pads, activated carbon and biological media (Substrat Pro, EHFimech); suited for freshwater and marine tanks up to 66 US gal. Known for quiet operation and durable, easy-to-service design.
- **Ideal For:** Ideal for the energy-efficiency question because it draws only 8 W while delivering 116 US gal/h flow, giving high flow per watt.

### EHEIM Classic 250 Canister Filter
```yaml
product: eheim-classic-250-canister-filter
brand: EHEIM
price_gbp: 134.57
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 250 l/h
filter_media_type: Filter pads and loose media (comes with coarse pad, fine pad, activated carbon pad)
maximum_tank_size: 80-250 L
filter_media_volume: 3.0 L
```

- **Price:** £134.57 [^4]
- **Summary:** The EHEIM Classic 250 is a reliable, low-energy external canister filter with quiet operation and a 250 l/h rated flow. It includes a filter basket and three pads (coarse, fine, carbon) and can be filled with loose media for biological filtration, suiting freshwater or marine tanks. Built for durability and easy maintenance, it fits medium aquariums.
- **Ideal For:** Suitable for someone seeking the most energy-efficient filter because it's a low-power, quiet-running canister with modest flow (250 l/h) and support for efficient layered media to minimize pump load.

### EHEIM ecco pro 300
```yaml
product: eheim-ecco-pro-300
brand: EHEIM
price_gbp: 134.54
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 750 l/h
filter_media_type: EHEIM SUBSTRATpro, EHEIM MECHpro, filter pads
maximum_tank_size: 300 l
energy_consumption: 8 W
filter_media_volume: 2.8 l
```

- **Price:** £134.54 [^5]
- **Summary:** A low-energy external canister filter delivering 750 l/h with only 8 W power draw, designed for aquariums up to 300 l. It includes three filter baskets pre-filled with EHEIM biological and mechanical media, rotatable shut-off taps, and a multifunction priming handle for easy maintenance. Suited to freshwater or saltwater setups needing efficient biological and mechanical filtration.
- **Ideal For:** Suitable for the most energy-efficient filter question because it runs at only 8 W while delivering 750 l/h and includes dedicated biological media (EHEIM SUBSTRATpro), giving high filtration per watt.

### EHEIM EHEIM Professional 5e Canister Filter
```yaml
product: eheim-eheim-professional-5e-canister-filter
brand: EHEIM
price_gbp: 351.35
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1500 l/h
filter_media_type: EHEIM filter media (included)
maximum_tank_size: 350 L
filter_media_volume: 4.5 L
```

- **Price:** £351.35 [^6]
- **Summary:** The EHEIM Professionel 5e is an electronically controlled canister filter with WiFi configuration, adjustable/constant flow modes, and intelligent functions (auto air out, service indicator, pulse/bio modes). It has a large canister and comes with original EHEIM filter media, suited to both freshwater and marine tanks up to 350 L.
- **Ideal For:** Ideal for buyers prioritizing energy-efficient operation due to its electronically adjustable output and constant-flow regulation (1500 l/h rated pump) which maintains performance with lower power needs.

### EHEIM Professional 5e 600 External Canister Filter
```yaml
product: eheim-professional-5e-600-external-canister-filter
brand: EHEIM
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1850 LPH
filter_media_type: mechanical, biological, chemical (includes bio media, pads)
maximum_tank_size: 600 L
energy_consumption: 10-35 W
```

- **Price:** £None [^7]
- **Summary:** Electronic external canister filter with adjustable flow up to 1850 LPH, integrated Wi‑Fi control modes (constant flow, bio, pulse), self-priming and safety features; suited to large freshwater or marine aquaria up to 600 L. Comes with EHEIM filter media and multiple filter baskets for staged mechanical, biological and chemical filtration.
- **Ideal For:** Ideal for energy‑efficient filtration because its electronically controlled pump delivers a maximum 1850 LPH while operating at a low power range of 10-35 W, giving strong flow with modest energy use.

### Fluval Fluval 07 Series Canister Filter 107
```yaml
product: fluval-fluval-07-series-canister-filter-107
brand: Fluval
price_gbp: 149.52
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 360 L/h
filter_media_type: Mechanical, chemical, biological (stacked media tower)
maximum_tank_size: 40-130 L
energy_consumption: 10 W
filter_media_volume: 2.0 L
```

- **Price:** £149.52 [^8]
- **Summary:** The Fluval 07-107 is a compact, energy-efficient canister filter with a 360 L/h flow rate, 2.0 L media capacity and a low 10 W power draw. It features a vertical pre-filter and stacked multi-stage media tower for mechanical, chemical and biological filtration, plus user-friendly self-priming and Aquastop valves. Suited to small freshwater or marine tanks requiring quiet, low-energy filtration.
- **Ideal For:** Ideal for the most energy-efficient filter search because it delivers 360 L/h flow using only 10 W, giving a very low watts-per-liter operating cost for small tanks.

### JBL CristalProfi e1501 greenline
```yaml
product: jbl-cristalprofi-e1501-greenline
brand: JBL
price_gbp: 149.52
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1400 litres per hour
filter_media_type: MicroMec sintered glass biological filter balls
maximum_tank_size: 160 - 600 litres
energy_consumption: 20 W
filter_media_volume: 12 litres
```

- **Price:** £149.52 [^9]
- **Summary:** The JBL CristalProfi e1501 greenline is an external canister filter with a 12 L canister volume, 1400 L/h flow, and low 20 W power draw. It includes JBL MicroMec biological media, adjustable flow, quick-start priming and 360° rotatable hose connections, suited for medium to large aquaria.
- **Ideal For:** Ideal for energy-efficiency comparisons because it consumes only 20 W while delivering 1400 L/h (70 L per W), giving high flow per watt among external filters. 

### OASE OASE Biomaster Thermo 250 Canister Filter
```yaml
product: oase-oase-biomaster-thermo-250-canister-filter
brand: OASE
price_gbp: 201.1
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 250 GPH
noise_level: 43 dB
filter_media_type: Hel-X biomedia, activated carbon, prefilter foams (coarse/medium/fine/ultra-fine)
maximum_tank_size: 70 gallons
energy_consumption: 15 Watts
filter_media_volume: 1.2 gallons
```

- **Price:** £201.1 [^10]
- **Summary:** The OASE BioMaster Thermo 250 is a compact external canister filter with an integrated heater, four-stage sealed filtration, EasyClean prefilter, adjustable flow, and Hel-X biological media for high surface area. It suits freshwater and marine aquariums up to 70 gallons where quiet operation and integrated heating are valued.
- **Ideal For:** Ideal for the energy-efficiency question because it uses only 15 Watts for the filter pump while combining integrated heater management and sealed multi-stage filtration to reduce redundant equipment.

### Sunsun Sunsun HW-304B Pro Canister Filter
```yaml
product: sunsun-sunsun-hw-304b-pro-canister-filter
brand: Sunsun
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 2000 L/h
filter_media_type: Mechanical, chemical, biological (media trays, coarse pad, filter pads, ceramic rings, bio-balls)
maximum_tank_size: 568 L
energy_consumption: 55 W + 9 W (UV)
```

- **Price:** £None [^11]
- **Summary:** The Sunsun HW-304B Pro is a high-flow canister filter with an integrated 9 W UV sterilizer and multiple media trays for mechanical, chemical, and biological filtration. It suits large freshwater or saltwater aquariums needing strong circulation and built-in UV clarification. The unit is self-priming and reported to deliver robust performance for tanks up to 568 L.
- **Ideal For:** Ideal for energy-efficiency comparisons because it specifies power use (55 W pump plus 9 W UV), allowing direct comparison of watts-per-flow against other filters.

### OASE BioMaster Thermo 600
```yaml
product: oase-biomaster-thermo-600
brand: OASE
price_gbp: 276.62
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 350 GPH
filter_media_type: Hel-X biomedia; pre-filter foams (carbon, 30 ppi, 20 ppi, 45 ppi, 60 ppi)
maximum_tank_size: 160 gallons
energy_consumption: 23 W
filter_media_volume: 1.8 gallons
```

- **Price:** £276.62 [^12]
- **Summary:** The OASE BioMaster Thermo 600 is an external canister filter with an integrated heater, four-stage sealed filtration, EasyClean pre-filter, and Hel-X biomedia for high biological surface area. It delivers 350 GPH and suits freshwater or marine aquaria up to 160 gallons while simplifying maintenance and reducing visible in-tank equipment. Ideal for users who want strong biological filtration plus built-in heating.
- **Ideal For:** Suitable for the question because its low filter power draw (23 W) for the filter combined with efficient Hel-X biomedia and integrated heater design provides high filtration surface area (1.8 gallons media) while minimizing additional equipment, making it among the more energy-efficient full-feature canister filters.

### EHEIM Professionel 5e 600
```yaml
product: eheim-professionel-5e-600
brand: EHEIM
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1850 LPH
filter_media_type: mechanical, biological, chemical (pads, sponges, ceramic, carbon)
maximum_tank_size: 600 L
energy_consumption: 10 - 35 Watt
filter_media_volume: 8 L
```

- **Price:** £None [^13]
- **Summary:** The EHEIM Professionel 5e 600 is an electronic external canister filter with WiFi control, adjustable flow up to 1850 LPH, and an 8 L media chamber; the 600T variant includes an integrated heater and is suitable for freshwater aquaria up to 600 L. It offers modes for constant flow, pulse, bio mode, auto-air purge, and service indicators, targeting advanced hobbyists who want precise control and long maintenance intervals.
- **Ideal For:** Suitable for energy-efficient filtration because its electronic pump delivers up to 1850 LPH while drawing only 10-35 W, giving high flow-per-watt efficiency compared with larger-consumption units.

### Tetra Tetra Whisper Power Filter 50
```yaml
product: tetra-tetra-whisper-power-filter-50
brand: Tetra
price_gbp: 14.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 105
noise_level: 40
filter_media_type: Bio-Bag (mechanical chemical biological)
maximum_tank_size: 20
```

- **Price:** £14.95 [^14]
- **Summary:** Hang-on-back power filter offering three-stage filtration with Bio-Bag cartridges, adjustable flow control, and quiet operation under 40 dB; designed for small tanks and easy cartridge replacement. Suits beginners and budget setups needing simple mechanical, chemical, and biological filtration.
- **Ideal For:** Suitable for someone seeking an energy-efficient small-tank filter because it serves 10-20 gallon tanks with a modest 105 GPH flow and low-noise operation (under 40 dB).

### Hydor Hydor Professional External Canister Filter ETH 200
```yaml
product: hydor-hydor-professional-external-canister-filter-eth-200
brand: Hydor
price_gbp: 7476.28
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
energy_consumption: 200 W
```

- **Price:** £7476.28 [^15]
- **Summary:** The Hydor ETH 200 is an external inline heater designed to fit into canister filter return lines, using PTC self-limiting technology for safe, precise temperature control; it's suitable for externally heating aquariums without placing a heater inside the tank. It offers models with different hose diameters and is recommended for aquariums roughly 100 to 200 litres depending on temperature rise required.
- **Ideal For:** Suitable for energy-efficient heating because it uses a 200 W PTC self-limiting element (200 W energy consumption) that provides precise temperature control with safety features.

### OASE BioMaster Thermo 100 Canister Filter
```yaml
product: oase-biomaster-thermo-100-canister-filter
brand: OASE
price_gbp: 109.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 160 GPH
filter_media_type: filter foam and ceramic media
maximum_tank_size: 30 gallons
energy_consumption: 11W
filter_media_volume: 0.34 gallons
```

- **Price:** £109.89 [^16]
- **Summary:** Compact canister filter with integrated heater, adjustable flow, and 2-stage mechanical and biological filtration; suited for freshwater and marine aquaria up to 30 gallons. Low power draw (11W) and a small media basket (0.34 gallons) make it a space-saving option with quiet operation features. Ideal for hobbyists who want an all-in-one filter-plus-heater for small tanks.
- **Ideal For:** Suitable for the most energy-efficient aquarium filter search because it uses only 11W for filtration while delivering 160 GPH, giving a high flow-per-watt ratio for small (30 gallon) tanks.

### Penn Plax Cascade 600 Canister Filter
```yaml
product: penn-plax-cascade-600-canister-filter
brand: Penn Plax
price_gbp: 9.19
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 175 GPH
filter_media_type: Physical, chemical, biological (activated carbon, sponge)
maximum_tank_size: 50 gal.
```

- **Price:** £9.19 [^17]
- **Summary:** The Cascade 600 is a fully submersible internal canister-style filter delivering 175 GPH for aquariums up to 50 gal. It provides physical, chemical and biological filtration with an internal sponge and activated carbon cartridge and includes an adjustable pump head and spray bar option for aeration. It suits small-to-medium freshwater or marine tanks needing compact, multi-stage filtration.
- **Ideal For:** Good for energy-efficient setups because it's compact and meant for tanks up to 50 gal with a 175 GPH pump, offering adequate flow without large canister power draw.

### Fluval Fluval 407 Performance Canister Filter
```yaml
product: fluval-fluval-407-performance-canister-filter
brand: Fluval
price_gbp: 171.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 383 GPH
filter_media_type: Bio-Foam Max; Bio-Foam; Bio-Foam+; Carbon; BIOMAX; Quick-Clear
maximum_tank_size: 50 to 100 US Gal
energy_consumption: 20 W
filter_media_volume: 9.2 L
```

- **Price:** £171.95 [^18]
- **Summary:** The Fluval 407 is a mid-to-large canister filter with eTEC efficient technology delivering 383 GPH flow, included multi-stage media, and low power draw (20 W). It fits 50-100 US gallon aquariums, offers easy maintenance with EZ-Lift media baskets and AquaStop valves, and is aimed at freshwater and saltwater hobbyists who want strong filtration with modest energy use. 
- **Ideal For:** Suitable for energy-conscious setups because it delivers 383 GPH while consuming only 20 W, providing high flow per watt.

### JBL CristalProfi e150 External Filter
```yaml
product: jbl-cristalprofi-e150-external-filter
brand: JBL
price_gbp: 245.04
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
flow_rate: 1400 L/h
filter_media_type: MicroMec biofilter balls and foam
maximum_tank_size: 600 L
energy_consumption: 20 W
filter_media_volume: 12 L
```

- **Price:** £245.04 [^19]
- **Summary:** The JBL CristalProfi e150 (sold as e1502 in many listings) is an energy-efficient external canister filter with a 1400 L/h flow, 12 L filter volume, and included biological media (MicroMec balls and foam). It features a built-in priming button, adjustable flow, 360° hose connections, and is supplied ready to install, suited for larger freshwater or marine tanks.
- **Ideal For:** Suitable for the most energy-efficient filter question because it delivers 1400 L/h while consuming only 20 W, offering high flow per watt.

---
## References & Sources
[^1]: Aquarium Connection, accessed 2026-06-12. https://aquariumconnection.com/product/aquaclear-70-box-filter-w-media/
[^2]: Biotope Aquarium Project, accessed 2026-06-12. https://biotopeaquariumproject.com/shop/aquael-ultramax-2000-filter/
[^3]: Aquaristikshop, accessed 2026-06-12. https://www.aquaristikshop.com/aquaristic/EHEIM-External-Filter-classic-250-2213/221301/
[^4]: Petco, accessed 2026-06-12. https://www.petco.com/shop/en/petcostore/product/eheim-classic-250-canister-filter
[^5]: Bulk Reef Supply (BRS Fresh), accessed 2026-06-12. https://fresh.bulkreefsupply.com/eheim-ecco-pro-300-canister-filter-eheim.html
[^6]: Bulk Reef Supply (BRS Fresh product page mirror), accessed 2026-06-12. https://www.bulkreefsupply.com/eheim-professionel-5e-350.html
[^7]: EHEIM (product page), accessed 2026-06-12. https://eheim.com/en_GB/aquatics/technology/external-filters/professionel-5e/professionel-5e-600t
[^8]: BF EFishtank (retailer listing), accessed 2026-06-12. https://bfefishtank.com/best-aquarium-filter-for-beginners/
[^9]: Desertcart, accessed 2026-06-12. https://mauritius.desertcart.com/products/48855949-jbl-6021200-cristal-profi-e-1501-greenline
[^10]: KensFish, accessed 2026-06-12. https://kensfish.com/products/oase-biomaster-thermo-250-filter
[^11]: Walmart, accessed 2026-06-12. https://www.walmart.com/ip/Sunsun-Hw304B-525GPH-Pro-Canister-Filter-Kit-with-9-watt-UV-Sterilizer/610382318
[^12]: FitzFishPonds, accessed 2026-06-12. https://fitzfishponds.com/biomaster-thermo-600-external-filter/
[^13]: FatafatService, accessed 2026-06-12. https://www.fatafatservice.com/appliance/brand/eheim/professionel-5e-600
[^14]: Pete's Aquatics, accessed 2026-06-12. https://petesaquatics.com/tetra-whisper-ex-power-filter-the-complete-review/
[^15]: Hydor (official product page), accessed 2026-06-12. https://hydor.com/products/eth
[^16]: AquaticPonds, accessed 2026-06-12. https://www.aquaticponds.com/Oase-FiltoSmart-Thermo-100-Economy-Aquarium-Filter_p_6549.html
[^17]: Marine and Reef, accessed 2026-06-12. https://www.marineandreef.com/Penn-Plax-Cascade-Replacement-Media-s/1118.htm
[^18]: Bulk Reef Supply, accessed 2026-06-12. https://fresh.bulkreefsupply.com/fluval-407-canister-filter-fluval.html
[^19]: Pet and Garden, accessed 2026-06-12. https://pet-and-garden.shop/jb602830-external-filter-jbl-cristalprofi-e1502-black-one-size?variant=7977872