OASE vs Fluval vs Eheim: Best Aquarium Filter Showdown
Choosing the right filtration system is crucial for maintaining a healthy aquarium environment. A quality filter removes harmful waste, provides biological filtration, and helps maintain water clarity. In this comprehensive comparison, we’ll examine three industry-leading brands: OASE, Fluval, and Eheim, to help you determine which aquarium filter best suits your specific needs.
Each of these manufacturers has established a reputation for quality, but they offer different features, technologies, and price points. Whether you’re setting up a new tank or upgrading your current filtration system, this detailed analysis will guide you through the key differences between OASE Bioplus Thermo 200, Fluval U4 Underwater Filter, and EHEIM Classic 2213 Canister Filter.
Feature Comparison: OASE vs Fluval vs Eheim Aquarium Filter
Before diving into detailed reviews, let’s compare the key specifications of these three popular aquarium filters. This side-by-side comparison will help you quickly identify which features matter most for your setup.
| Feature | OASE Bioplus Thermo 200 | Fluval U4 Underwater Filter | EHEIM Classic 2213 |
| Filter Type | External Canister with Heater | Internal/Underwater | External Canister |
| Flow Rate | 700 L/h (185 GPH) | 1000 L/h (260 GPH) | 440 L/h (116 GPH) |
| Tank Capacity | Up to 200 L (53 gal) | Up to 240 L (65 gal) | Up to 250 L (66 gal) |
| Filter Media | Mechanical, Biological, Chemical | Mechanical, Biological, Chemical | Mechanical, Biological |
| Heating Function | Yes (Integrated) | No | No |
| Noise Level | Low-Medium | Low | Very Low |
| Media Capacity | Medium | Low | High |
| Maintenance Frequency | Medium (Pre-filter: 2-4 weeks) | High (1-2 weeks) | Low (4-6 weeks) |
| Price Range | $$$ | $ | $$ |
Now that we’ve seen the basic specifications, let’s examine each filter in detail to understand their unique features, advantages, and potential drawbacks.
OASE Bioplus Thermo 200 Review
The OASE Bioplus Thermo 200 represents the latest in aquarium filtration technology, combining efficient filtration with an integrated heating system. This German-engineered filter is designed for freshwater and marine aquariums up to 200 liters (53 gallons), making it suitable for most home setups.
What sets the OASE apart from competitors is its innovative pre-filter system and built-in heater. The pre-filter allows for quick maintenance without disturbing the main biological filtration media, while the integrated heater eliminates the need for a separate in-tank heating unit, creating a cleaner look in your aquarium.
Key Features
- Integrated thermostat heater (adjustable from 68-93°F)
- Easy-access pre-filter for quick maintenance
- Flow rate of 700 L/h (185 GPH)
- Multi-stage filtration system
- Standard 16/22mm hose connections
- Quiet operation with advanced pump technology
- Easy priming system for hassle-free startup
Pros
- Integrated heater saves space and reduces equipment
- Easy-access pre-filter reduces maintenance time
- Good flow rate for tanks up to 200L
- Comprehensive filtration media included
- Self-priming system for easy startup
Cons
- Higher price point than competitors
- Some users report air leakage issues
- Slightly noisier than premium alternatives
- Pre-filter requires frequent cleaning in heavily stocked tanks
- Larger footprint than some canister filters
Real-World Performance
In practice, the OASE Bioplus Thermo 200 delivers excellent water clarity and efficient biological filtration. The integrated heater maintains consistent temperature, eliminating cold spots in the aquarium. Users particularly appreciate the easy-access pre-filter, which can be cleaned without disconnecting the entire unit, though some report it needs cleaning more frequently than expected.
Forum discussions reveal mixed experiences with noise levels. While many users find it acceptably quiet, others report issues with air bubbles causing gurgling sounds. This appears to be more common in the thermo models and may require occasional maintenance to resolve.
OASE Bioplus Thermo 200
Experience premium filtration with integrated heating technology. Perfect for aquarists looking to reduce in-tank equipment while maintaining excellent water quality.
Fluval U4 Underwater Filter Review
The Fluval U4 Underwater Filter takes a different approach to aquarium filtration as an internal filter that sits inside your tank. Designed for aquariums up to 240 liters (65 gallons), this versatile filter offers 3-way flow control and multiple filtration stages in a compact package.
Unlike the canister filters in this comparison, the Fluval U4 is designed to be fully submerged in your aquarium. This design eliminates the need for external plumbing but does occupy some in-tank space. The filter’s adjustable positioning and directional output make it suitable for various tank configurations.
Key Features
- 3-way adjustable flow control system
- Flow rate of 1000 L/h (260 GPH)
- Flip-top access for easy media changes
- Adjustable positioning (vertical or horizontal)
- Multiple filtration chambers
- Compact design with small footprint
- Integrated spray bar option
Pros
- Excellent value for money
- No external plumbing required
- Highly adjustable flow direction and intensity
- Easy access for maintenance
- Quiet operation
- Versatile positioning options
Cons
- Occupies in-tank space
- Limited media capacity compared to canisters
- Requires more frequent maintenance
- Not suitable for tanks with jumpy fish
- Separate heater still required
Real-World Performance
The Fluval U4 excels in situations where simplicity and accessibility are priorities. Its adjustable flow system allows for precise control over water movement, making it suitable for a variety of fish species. The filter performs particularly well in tanks with moderate bioloads and is often praised for its quiet operation.
Users appreciate the ease of maintenance, with quick access to filter media without removing the entire unit from the tank. However, the limited media capacity means more frequent cleaning is necessary compared to canister filters, especially in heavily stocked aquariums.
Fluval U4 Underwater Filter
Versatile internal filtration with adjustable flow control. Ideal for aquarists seeking simplicity, flexibility, and excellent value for money.
EHEIM Classic 2213 Canister Filter Review
The EHEIM Classic 2213 represents the gold standard in canister filtration, with a reputation built on decades of reliability and performance. This German-engineered filter is designed for aquariums up to 250 liters (66 gallons) and features EHEIM’s signature quality construction.
What distinguishes the EHEIM Classic series is its simplicity and durability. With fewer moving parts than modern designs, these filters are known to run for years with minimal issues. The Classic 2213 offers excellent biological filtration capacity and whisper-quiet operation that has made EHEIM a favorite among serious aquarists.
Key Features
- Flow rate of 440 L/h (116 GPH)
- Permo-elastic silicon sealing ring
- Includes high-quality filter media
- Extremely quiet operation
- Durable pump with ceramic shaft
- Large media capacity
- Energy-efficient design (8W)
Pros
- Exceptional reliability and longevity
- Nearly silent operation
- Excellent biological filtration capacity
- Energy efficient (only 8W)
- High-quality construction
- Readily available replacement parts
Cons
- Lower flow rate than competitors
- Manual priming required
- No pre-filter for quick maintenance
- Basic design lacks modern conveniences
- Separate heater required
Real-World Performance
The EHEIM Classic 2213 consistently delivers exceptional filtration performance with remarkable reliability. Users frequently report these filters running for 5-10 years with only basic maintenance. The biological filtration capacity is particularly impressive, with the included EHEIM Substrat Pro media providing excellent surface area for beneficial bacteria.
Forum discussions highlight the filter’s near-silent operation as a major advantage, especially for aquariums in living spaces or bedrooms. While the flow rate is lower than some competitors, many aquarists find it ideal for planted tanks or setups with fish that prefer gentle currents.
EHEIM Classic 2213 Canister Filter
Legendary reliability meets exceptional filtration performance. The trusted choice of experienced aquarists for decades.
Detailed Comparison Analysis
Filtration Efficiency
When comparing filtration efficiency, all three filters provide excellent water quality but through different approaches:
OASE Bioplus Thermo 200
The OASE offers good all-around filtration with its multi-stage system. The pre-filter catches larger debris before it reaches the main biological media, extending maintenance intervals for the primary filtration. Its flow rate of 700 L/h provides good circulation for tanks up to 200L.
Fluval U4 Underwater
The Fluval U4 provides the highest flow rate at 1000 L/h, but its internal design limits media capacity. It excels at mechanical filtration and water movement but may not match canister filters for biological filtration capacity. The adjustable flow direction is a significant advantage for targeting specific areas.
EHEIM Classic 2213
Despite having the lowest flow rate at 440 L/h, the EHEIM excels in biological filtration due to its large media capacity and efficient design. The single-chamber approach allows for customized media arrangements, and the included Substrat Pro media provides superior bacterial colonization.
Maintenance Requirements
Maintenance frequency and complexity vary significantly between these filters:
OASE Bioplus Thermo 200
The OASE’s pre-filter system allows for quick maintenance of the mechanical filtration without disturbing biological media. The pre-filter typically needs cleaning every 2-4 weeks, while the main chamber requires attention every 2-3 months. The integrated heater eliminates separate heater maintenance.
Fluval U4 Underwater
The Fluval U4 requires the most frequent maintenance, typically every 1-2 weeks, but the process is straightforward. The flip-top design provides easy access to all media without removing the filter from the tank. This convenience makes regular maintenance less of a chore.
EHEIM Classic 2213
The EHEIM requires the least frequent maintenance, often running 4-6 weeks between cleanings. However, maintenance is more involved, requiring disconnection of hoses and complete disassembly. The lack of a pre-filter means all media must be cleaned during maintenance sessions.
Noise Levels
For many aquarists, especially those with tanks in living spaces or bedrooms, noise level is a crucial consideration:
OASE Bioplus Thermo 200
The OASE produces moderate noise levels, with some users reporting occasional gurgling due to trapped air. This issue appears more common in the thermo models. When functioning optimally, noise is acceptable but not silent.
Fluval U4 Underwater
The Fluval U4 operates quietly, with water movement creating more sound than the motor itself. The submersed design naturally dampens motor noise, though you may hear a gentle hum and water movement.
EHEIM Classic 2213
The EHEIM Classic 2213 is renowned for its near-silent operation. Many users report being unable to tell if the filter is running without visual confirmation. The ceramic shaft and precision engineering contribute to this exceptional quietness.
Value Proposition
When considering overall value, we need to account for initial cost, running expenses, and long-term reliability:
OASE Bioplus Thermo 200
The OASE has the highest initial cost but includes an integrated heater, potentially saving money on a separate purchase. Energy consumption is moderate, and the pre-filter system can extend the life of more expensive biological media.
Fluval U4 Underwater
The Fluval U4 offers the best initial value, with the lowest purchase price. Operating costs are low, though more frequent media replacements may add up over time. The simplicity means fewer potential failure points.
EHEIM Classic 2213
The EHEIM sits in the middle for initial cost but offers exceptional long-term value. Its legendary durability means replacement is rarely necessary, and the energy-efficient 8W motor keeps running costs minimal. Replacement parts are readily available even for older models.
Special Considerations for Different Setups
Planted Aquariums
Planted aquariums have specific filtration needs that differ from fish-only setups. Flow pattern, CO2 distribution, and nutrient circulation all play important roles in plant health.
Best Choice for Planted Tanks
For heavily planted aquariums, the EHEIM Classic 2213 often proves ideal. Its gentle flow prevents excessive surface agitation (which can drive off CO2) while still providing adequate circulation. The customizable media allows for specialized biological filtration without chemical media that might remove plant nutrients.
The OASE is also suitable for planted tanks, with its adjustable flow rate and integrated heater keeping the aesthetic clean. The Fluval U4’s adjustable flow direction can be useful for targeting CO2 distribution but may be visually intrusive in a nature aquascape.
Reef and Marine Setups
Marine aquariums typically require higher flow rates and specialized media for removing phosphates and other compounds. While all three filters can be used in marine setups, they may need supplemental equipment.
Best Choice for Marine Tanks
For marine aquariums, the OASE Bioplus Thermo 200 offers advantages with its higher flow rate and integrated heater, which is beneficial for maintaining stable temperatures crucial for coral health. The pre-filter system also helps manage the higher debris load common in reef tanks.
Both the EHEIM and Fluval would likely need to be supplemented with additional powerheads or wavemakers to achieve the flow rates recommended for marine environments.
Small to Nano Aquariums
For smaller aquariums under 20 gallons, considerations shift toward appropriate sizing and avoiding excessive flow that could stress inhabitants.
Best Choice for Small Tanks
The Fluval U4 offers the most flexibility for small tanks, as its flow rate is adjustable, and it can be positioned horizontally to minimize its footprint. The smaller Fluval U2 or U3 models might be even more appropriate for nano tanks.
Both the OASE and EHEIM canister filters are generally oversized for nano aquariums, though they can be used with flow reducers if necessary. Their external design does save valuable in-tank space, which is at a premium in small setups.
Editor’s Choice: EHEIM Classic 2213
Why We Recommend the EHEIM Classic 2213
After thorough testing and analysis, we’ve selected the EHEIM Classic 2213 as our Editor’s Choice for aquarium filtration. This legendary filter combines exceptional reliability, superior biological filtration, and whisper-quiet operation in a package that has stood the test of time.
While the EHEIM Classic 2213 lacks some modern conveniences like a pre-filter or integrated heater, its core performance is unmatched. The simple, reliable design has fewer potential failure points, contributing to its exceptional longevity. Many aquarists report their EHEIM filters running flawlessly for 10+ years with only basic maintenance.
What Sets It Apart
- Unmatched Reliability: The EHEIM’s track record for dependability is legendary in the aquarium hobby
- Superior Biological Filtration: Large media capacity and efficient design create optimal conditions for beneficial bacteria
- Nearly Silent Operation: Perfect for tanks in living spaces, bedrooms, or offices
- Energy Efficiency: 8W power consumption is significantly lower than competitors
- Long-Term Value: Higher initial quality means fewer replacements and repairs over time
- Excellent Parts Availability: Replacement components are readily available even for older models
EHEIM Classic 2213 – Editor’s Choice
Experience the legendary reliability and performance that has made EHEIM the trusted choice of aquarists worldwide.
Frequently Asked Questions
How often should I clean my aquarium filter?
Cleaning frequency depends on your specific filter, tank size, and bioload. As a general guideline:
- OASE Bioplus Thermo 200: Pre-filter every 2-4 weeks, main media every 2-3 months
- Fluval U4: Every 1-2 weeks for optimal performance
- EHEIM Classic 2213: Every 4-6 weeks for most setups
Always clean filter media in used tank water, not tap water, to preserve beneficial bacteria.
Can I use these filters for both freshwater and saltwater aquariums?
Yes, all three filters can be used in both freshwater and saltwater setups. However, marine aquariums typically require higher flow rates and may need supplemental powerheads or wavemakers. For reef tanks, you might need to customize the filter media to include phosphate removers or other specialized media.
Do I need to buy additional filter media?
All three filters come with basic media to get started:
- OASE Bioplus Thermo 200: Includes mechanical, biological, and some chemical media
- Fluval U4: Includes foam, carbon, and BioMax biological media
- EHEIM Classic 2213: Includes EHEIM Mech, Substrat Pro, and filter pads
For optimal performance, you might consider additional specialized media based on your specific aquarium needs, such as extra biological media for heavily stocked tanks or chemical media for specific water issues.
How do I prime a canister filter?
Priming methods vary by filter:
- OASE Bioplus Thermo 200: Features a self-priming system – simply fill the canister with water, close it, and start the pump
- Fluval U4: As an internal filter, no priming is required – it’s already submerged
- EHEIM Classic 2213: Requires manual priming – fill the canister with water, connect hoses, and create suction on the outlet tube or use a separate priming bulb
Which filter is best for a planted aquarium?
For planted aquariums, the EHEIM Classic 2213 is often considered ideal due to its gentle flow that won’t disturb plants or cause excessive surface agitation (which can drive off CO2). Its customizable media chambers also allow for specialized biological filtration without chemical media that might remove plant nutrients.
The OASE is also suitable with its adjustable flow rate, while the Fluval U4’s directional outputs can be useful for targeting CO2 distribution in specific areas of the tank.
Final Verdict: Choosing the Right Filter for Your Aquarium
After comprehensive testing and analysis of the OASE Bioplus Thermo 200, Fluval U4 Underwater Filter, and EHEIM Classic 2213, we can confidently provide recommendations based on your specific needs:
Choose OASE Bioplus Thermo 200 if:
- You want an integrated heater to reduce in-tank equipment
- Easy maintenance is a top priority
- You prefer a modern design with convenient features
- Tank space is limited and external filtration is preferred
- You’re willing to pay more for convenience features
Choose Fluval U4 Underwater if:
- Budget is a primary consideration
- You prefer internal filtration without external plumbing
- Adjustable flow direction is important for your setup
- You want the simplest maintenance procedure
- You need a filter for a smaller tank or temporary setup
Choose EHEIM Classic 2213 if:
- Long-term reliability is your top priority
- You want the quietest possible operation
- Excellent biological filtration is essential
- Energy efficiency matters to you
- You prefer proven technology over newer features
Each of these filters represents a different approach to aquarium filtration, with its own strengths and compromises. Your specific tank size, stocking level, and personal preferences will ultimately determine which is the best fit for your aquarium.
Our Editor’s Choice, the EHEIM Classic 2213, earns its recommendation through exceptional reliability, superior biological filtration, and whisper-quiet operation. While it lacks some modern conveniences, its core performance and longevity make it the standout option for most aquarists.
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