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OASE Indoor Aquatics Biomaster Thermo 250,Black

4.4 4.4 out of 5 stars 237 ratings

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Biomaster Thermo 250

Purchase options and add-ons

Brand OASE Indoor Aquatics
Product Dimensions 9.4"W x 14.6"H
Color Black
Wattage 165 watts
Voltage 120 Volts
Capacity
70 Gallons
Power Source
Corded Electric

About this item

  • The Bio master thermos 250 has an integrated heater in compact Filter design
  • The built-in heater provides your aquarium with Precise and uniform temperature levels while the product integration delivers unobstructed views of your Aquarium
  • External filter operates quietly to circulate and filter your aquarium water
  • Includes 4-stage filtration: biological, mechanical, chemical, and prefiltration
  • Hel-x, suspended Filter media, creates the optimal surface area for beneficial bacteria growth

Customer ratings by feature

Easy to clean
4.3 4.3
Easy to remove
4.1 4.1
Suction power
3.7 3.7
Value for money
3.6 3.6

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From the manufacturer

OASE Indoor Aquatics Biomaster Thermo

  • Integrated heater – Provides precise and uniform temperature levels and reduces the amount of equipment seen inside the aquarium by housing the heater in the unit
  • EasyClean pre-filter module – Module can be removed separately from the rest of the filter. This reduces maintenance, increases filter efficiency, and extends the life of main filter foams. Customize the pre-filter with coarse 30 ppi, fine 45 ppi, ultra-fine 60 ppi, and activated carbon 45 ppi filter foams.
  • No mess maintenance – Integrated safety locking features on the handle, pre-filter, and check valve in the inlet/outlet connection unit, ensure no accidental spillage or messy maintenance
  • Sealed filtration pathways – Allows for the full benefits of all four stages of filtration through this intuitive design

  • Hel-X Biomedia – An extremely large protected settlement surface (800m²/1000 liter) that allows beneficial bacteria to grow and thrive. The material is designed to stop floating as soon as it reaches a certain level of bacteria colonization.
  • Carbon pre-filter foams – Activated carbon absorbs unwanted substances in aquarium water. Carbon filter foams make replacement much simpler.
  • Adjustable flow control – Flow can be adjusted for the inlet and outlet in multiple locations on the filter assembly
  • Easy priming – Includes simple priming for fast and easy startup and continued operation
  • Quiet operation – Sound dampening design
  • Ideal for use in aquariums up to 70 gallons

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 9.4 x 9.4 x 14.6 inches; 14.24 Pounds
  • Item model number ‏ : ‎ 55148
  • Date First Available ‏ : ‎ December 19, 2018
  • Manufacturer ‏ : ‎ OASE
  • ASIN ‏ : ‎ B07LHD941X
  • Customer Reviews:
    4.4 4.4 out of 5 stars 237 ratings

Looking for specific info?

Product Description

The biomaster Thermo line of premium external filters with integrated heaters are perfect for marine and freshwater aquariums. The biomaster Thermo 250 boasts 4-stage filtration in a compact design. With the heater integrated into your filter, there is more room for undisrupted beauty in your aquarium. Biological, mechanical, chemical, and prefiltration all work together to provide your aquarium with optimal water quality and clarity. The biomaster filters are designed with sealed filtration pathways to ensure water flow is getting the full benefits of prefiltration, filter media for clearer water, hel-x biomedia provide a large suspended settlement surface for microorganisms, and activated carbon for ideal nutrient reduction and removal of toxins. The easy clean pre-filter module can be removed and cleaned separately from the rest of the filter for high efficiency and to extend the life of your filter. The water flow Can easily be adjusted on both the inlet and outlet adapters for the filter. Created for convenient placement under the aquarium. Install the included diffuser and spray bar for uniform surface movement and additional dissolved oxygen for ideal water quality. This filter Also features a N handle for simple moving and maintenance. This energy-efficient design includes a self-priming function for easy operation on startup and after cleaning. Includes a shut-off automation with built-in check valve to prevent leakage when cleaning the filter. Designed using German engineering and manufactured in Italy, this quiet operating filter is supported by an included 3 year warranty with a free 1 year warranty extension with online product to customize your pre-filter by combining coarse, Fine, ultra Fine, and activated carbon filter foams.

Important information

Directions

As directed on packaging

Customer reviews

4.4 out of 5 stars
4.4 out of 5
237 global ratings

Customers say

Customers like the filter, performance, ease of cleaning, and quality of the water heater. For example, they mention it's quiet, works well, and has been running without any issues. Some appreciate the ease of setup. That said, opinions are mixed on noise and value.

AI-generated from the text of customer reviews

29 customers mention23 positive6 negative

Customers like the filter. They say it's quiet, has an awesome pre-filter area, and filters well. They also appreciate the pre- filter on the intake that can be pulled out and cleaned separately. Overall, customers are happy with their purchase and recommend it to others.

"...2: It has a pre-filter on the intake that can be pulled out and cleaned separately, so you don't have to always clean the whole canister, and you..." Read more

"...The pre-filter area is awesome. Oase offers 30ppi, 45ppi, 60ppi and 45ppi carbon sponges for the pre-filter. Mine came with the 45ppi carbon sponges...." Read more

"...The two features I like the most are the pre-filter access and the stacking trays for various filtration media...." Read more

"This is the best canister filter I personally have ever had. I have been using for over a month now...." Read more

22 customers mention19 positive3 negative

Customers like the performance of the water heater. For example, they say it's easy to set up, works well, and has been running without any issues. Some say it has smart functionality that is amazing and helpful. Overall, most are satisfied with the performance and functionality of the product.

"...original black fine pads for the prefilter, because they work the best for trapping muck and not letting it through to the main filter...." Read more

"...It works perfectly! No spikes in nitrite or nitrates. Everything is settled in my tank now and I'm growing purple coraline algae...." Read more

"...It worked awesome, if i still had a fresh water tank this is what I would use...." Read more

"...The one thing I can state is great is the priming pump. That is amazing and helpful...." Read more

18 customers mention15 positive3 negative

Customers like the ease of cleaning the water heater. They mention that the pre filter cleaning is simple with no mess, and the canister stays clean. They also appreciate the filter on the intake that can be pulled out and cleaned separately. Overall, customers are happy with the ease and functionality of the product.

"...2: It has a pre-filter on the intake that can be pulled out and cleaned separately, so you don't have to always clean the whole canister, and you..." Read more

"...The benefit is my water gets a polished look and the canister stays clean so I dont have to open and clean it very often...." Read more

"...It was very easy to set up! Even easier to clean! You cannot hear it at all. It's completely silent...." Read more

"...Its a way more cleaner and robust system to a hang on the back waterfall style filter...." Read more

18 customers mention13 positive5 negative

Customers like the quality of the water heater. They mention that it comes with a built-in heater, which is great. They also appreciate the integration of the heater into the filter, which keeps everything consolidated. Customers also mention that the temp in the aquarium stays at 78.4.

"...1: It comes with a built in heater which is great, because that's less clutter in your aquarium...." Read more

"...I have been using for over a month now. Water is clear, temp in aquarium stays at 78.4, so quiet, good flow...." Read more

"...The built in heater is pretty sweat at keeping everything consolidated...." Read more

"...The integrated heater is an awesome idea, but the thermostat doesn't match the temperature of the water that comes out...." Read more

13 customers mention13 positive0 negative

Customers find the water heater easy to set up and maintain. They say it has great filtering capacity, is easy to use, and is self-priming. Customers also mention that it takes about five minutes to start up and is efficient.

"...60ppi sponges I rinse them thoroughly every week but the process of doing so is so simple and quick...." Read more

"I've had this for a few months now for my first tank. It was very easy to set up! Even easier to clean! You cannot hear it at all...." Read more

"...EASY to set up and to pump to get started...." Read more

"...The removable prefilter cuts down on maintenance a lot and makes it less cumbersome than other similar filters that dont have that feature...." Read more

33 customers mention17 positive16 negative

Customers are mixed about the noise of the water heater. Some mention that it's entirely quiet with no hum or water noise. However, others say that it makes a little noise when it turns on.

"...3: It comes with 4 trays to add media too. 4: It's super quiet, my 60 gal rated air pump is louder then both of my 250Ts combined, and the air pump..." Read more

"...To start it is silent!. When I first turned it on there was a slight water trickle noise which completely went away after a few hours...." Read more

"...It was very easy to set up! Even easier to clean! You cannot hear it at all. It's completely silent...." Read more

"...Water is clear, temp in aquarium stays at 78.4, so quiet, good flow. EASY to set up and to pump to get started...." Read more

16 customers mention7 positive9 negative

Customers are mixed about the value of the water heater. Some mention that it's worth the price, has great features for the cost, and is well put together. However, others say that it is not worth the money, a waste of money, and a poor product.

"...most canister filters, but has 2 great features that make it worth the extra price...." Read more

"...EASY to set up and to pump to get started. It is more expensive, but if you add a good heater into the cost of the filter, it is probably very..." Read more

"If realestate or clenleness is important in your tank than the hefty price is worth it. Not having to put that unsightly corded heater in your tank...." Read more

"For the Price this is not worth it. I have had nothing but issues with it. I dont have all the pieces for the intake and outflow pipes...." Read more

8 customers mention0 positive8 negative

Customers are dissatisfied with the air purging of the water heater. They mention that it draws air frequently, it occasionally takes in air and purges it into the tank, and the filter leaks air. Some customers also report inaccurate temperature and constant off gassing.

"...about a year now on a 20G long, only complaint is that it occasionally takes in air and purges it into the tank making it a little noisy!..." Read more

"...hasn't actually stopped it from operating (yet), just periodically blows air into the tank." Read more

"...Update: Will frequently purge air which is loud and obnoxious" Read more

"...I purge air from it almost daily. It is constantly sucking in air from somewhere...." Read more

Best Canister Filter Ever!
5 Stars
Best Canister Filter Ever!
I LOVE IT! I've been using two of these Thermo 250's on my freshwater 55 gal, for 3 weeks+ now. The Thermo 250 cost a lil more than most canister filters, but has 2 great features that make it worth the extra price. 1: It comes with a built in heater which is great, because that's less clutter in your aquarium. 2: It has a pre-filter on the intake that can be pulled out and cleaned separately, so you don't have to always clean the whole canister, and you can keep that good bacteria growing in the main filter trays. 3: It comes with 4 trays to add media too. 4: It's super quiet, my 60 gal rated air pump is louder then both of my 250Ts combined, and the air pump really quiet. I have not had to do any maintenance in my first month of running and the water flow is still very strong in my heavily fish stocked/planted aquarium. I have to be honest though; I'm only using the coarse circular intake filter pads that came with it, because I upgraded just about everything else. I also added jardli glass water intake and glass water outtake for that kool less clutter look. This is because I did some serious research on the net and good ol youtube. After a long search on all types of aquarium filters ie.. hang on back, canister, sponge, under gravel and sup, I came across this Thermo 250 Canister from Oase. Now just about all if not every youtube video on it was from a none english speaking country. Then I seen this random video that said "pimpmyfilter". I clicked on it and some British guy named the "pondguru" was giving a demonstration on how to make the Thermo 600 model more efficient. After watching that video I was completely hooked/sold on his way of making the Thermo Canister filter more efficient. I didn't do the drilling though, cause it doesn't seem to be needed, the water flow is still very strong. With that being said I can't give an honest opinion on how good the filter media is that came with it like the meduim and fine pads and the ceramic balls. Because, I pimped out both of my Thermo 250s from start. I am using the original black fine pads for the prefilter, because they work the best for trapping muck and not letting it through to the main filter. No matter what type of filter you get whether it's this one or another model or brand, I highly highly recommend that you go on YouTube and type "pimpmy(filter name here)filter" ie pimpmyoasethermofilter, pimpmyfluvalfilter, pimpmywhateverfilter. I promise you that that will be the most helpful thing you ever did when it comes to searching for and aquarium filter. No-one on the internet that I've seen is doing anything remotely close to what that guy does to aquarium fliters. He didn't pay me or ask me to promote his channel. He'll probably never know that I'm promoting his work. I'm just giving him mad props because he deserves it. Watch and see, and I bet you'll come back looking for this review to say that it really helped you.
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Top reviews from the United States

Reviewed in the United States on January 29, 2020
Style: Biomaster Thermo 250Verified Purchase
Customer image
5.0 out of 5 stars Best Canister Filter Ever!
Reviewed in the United States on January 29, 2020
I LOVE IT! I've been using two of these Thermo 250's on my freshwater 55 gal, for 3 weeks+ now. The Thermo 250 cost a lil more than most canister filters, but has 2 great features that make it worth the extra price. 1: It comes with a built in heater which is great, because that's less clutter in your aquarium. 2: It has a pre-filter on the intake that can be pulled out and cleaned separately, so you don't have to always clean the whole canister, and you can keep that good bacteria growing in the main filter trays. 3: It comes with 4 trays to add media too. 4: It's super quiet, my 60 gal rated air pump is louder then both of my 250Ts combined, and the air pump really quiet. I have not had to do any maintenance in my first month of running and the water flow is still very strong in my heavily fish stocked/planted aquarium. I have to be honest though; I'm only using the coarse circular intake filter pads that came with it, because I upgraded just about everything else. I also added jardli glass water intake and glass water outtake for that kool less clutter look. This is because I did some serious research on the net and good ol youtube. After a long search on all types of aquarium filters ie.. hang on back, canister, sponge, under gravel and sup, I came across this Thermo 250 Canister from Oase. Now just about all if not every youtube video on it was from a none english speaking country. Then I seen this random video that said "pimpmyfilter". I clicked on it and some British guy named the "pondguru" was giving a demonstration on how to make the Thermo 600 model more efficient. After watching that video I was completely hooked/sold on his way of making the Thermo Canister filter more efficient. I didn't do the drilling though, cause it doesn't seem to be needed, the water flow is still very strong. With that being said I can't give an honest opinion on how good the filter media is that came with it like the meduim and fine pads and the ceramic balls. Because, I pimped out both of my Thermo 250s from start. I am using the original black fine pads for the prefilter, because they work the best for trapping muck and not letting it through to the main filter. No matter what type of filter you get whether it's this one or another model or brand, I highly highly recommend that you go on YouTube and type "pimpmy(filter name here)filter" ie pimpmyoasethermofilter, pimpmyfluvalfilter, pimpmywhateverfilter. I promise you that that will be the most helpful thing you ever did when it comes to searching for and aquarium filter. No-one on the internet that I've seen is doing anything remotely close to what that guy does to aquarium fliters. He didn't pay me or ask me to promote his channel. He'll probably never know that I'm promoting his work. I'm just giving him mad props because he deserves it. Watch and see, and I bet you'll come back looking for this review to say that it really helped you.
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Reviewed in the United States on June 14, 2019
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Top reviews from other countries

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G.P
5.0 out of 5 stars Excellent Filter
Reviewed in Canada on August 10, 2022
Style: Biomaster Thermo 250Verified Purchase
One person found this helpful
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Joseph
5.0 out of 5 stars Great product!
Reviewed in Canada on July 30, 2020
Style: Biomaster Thermo 250Verified Purchase
2 people found this helpful
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Claude Jobin
5.0 out of 5 stars Filtration
Reviewed in Canada on December 7, 2023
Style: Biomaster Thermo 250Verified Purchase
Nam
3.0 out of 5 stars Annoying burping noise
Reviewed in Canada on June 24, 2023
Style: Biomaster Thermo 250Verified Purchase
Samuel
5.0 out of 5 stars Works like a charm
Reviewed in Canada on August 9, 2022
Style: Biomaster Thermo 250Verified Purchase
2 people found this helpful
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