---
product_id: 97759363
title: "OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering"
brand: "oase"
price: "708.85 DT"
currency: TND
in_stock: false
reviews_count: 13
url: https://www.desertcart.tn/products/97759363-oase-biomaster-thermo-external-filter-with-built-in-heater-aquariums
store_origin: TN
region: Tunisia
---

# 250 GPH powerful flow rate Ultra-quiet external filter 150W built-in heater OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering

**Brand:** oase
**Price:** 708.85 DT
**Availability:** ❌ Out of Stock

## Summary

> 🔥💧 Silence meets power: The all-in-one aquarium filter that heats, cleans, and impresses.

## Quick Answers

- **What is this?** OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering by oase
- **How much does it cost?** 708.85 DT with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/97759363-oase-biomaster-thermo-external-filter-with-built-in-heater-aquariums)

## Best For

- oase enthusiasts

## Why This Product

- Trusted oase brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Custom Flow Control:** Adjustable inlet and outlet flow settings tailor water circulation to your tank’s unique ecosystem needs.
- • **Whisper-Quiet Operation:** External canister design runs silently, letting your aquarium be the star without background noise distractions.
- • **Effortless Maintenance Mode:** EasyClean prefilter module detaches separately, extending filter life and simplifying routine cleaning.
- • **Integrated Heating Powerhouse:** Built-in 150W heater ensures precise, uniform temperature control—no extra clutter, just perfect aquatic comfort.
- • **Quad-Stage Filtration Mastery:** Biological, mechanical, chemical, and pre-filtration combine seamlessly for crystal-clear, healthy water.

## Overview

The OASE Indoor Aquatics Biomaster Thermo 250 is a premium external canister filter with an integrated 150W heater, designed for aquariums up to 70 gallons. It delivers a robust 250 gallons per hour flow rate through a sophisticated 4-stage filtration system (biological, mechanical, chemical, and pre-filtration) housed in a compact, quiet unit. Featuring an EasyClean prefilter for hassle-free maintenance and adjustable flow controls, it ensures optimal water clarity and temperature stability while maintaining an unobstructed aquarium view. Backed by a 3-year limited warranty plus 1-year extension, it’s the smart choice for millennial professionals seeking sleek, efficient aquatic care.

## Description

The OASE BioMaster Filter is a game-changer for aquarium enthusiasts, offering convenience and efficiency. Its unique EasyClean Pre-filter module allows you to quickly remove and clean it without having to disassemble the entire unit. This reduces maintenance time and boosts the filter's performance while prolonging the life of the main foams. The best part? Thanks to quicker and simple maintenance, you spend more time enjoying your beautiful aquarium! Even better, the BioMaster Thermo models come with a built-in heater that not only reduces clutter inside the tank, but it also keeps your aquatic inhabitants safe from direct contact with the heater. You can easily adjust the temperature between 66°F and 90°F and also calibrate within +/- 2°F. - ensuring the perfect environment for your fish. The BioMaster's four-stage filtration system guarantees crystal clear water, as it flows through various media, including activated carbon and OASE Hel-X Biomedia, creating an ideal habitat for beneficial bacteria. Safety is also a top priority, with secure locks and an aquastop feature that prevents spills during cleaning. Manufactured in Italy with German engineering, this filter quality is unmatched and OASE stands behind the quality of the product with a 4-year warranty (3 + 1 year when you register online). Included in the box are all the necessary accessories for your set-up, so you'll be up and running so you can enjoy your aquarium!

Review: 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.
Review: Great for Saltwater Reef Tank - The Oase Thermo Biomaster 250 canister filter has truly impressed me with its performance and features. Here are the key points I found noteworthy: Design and Build Quality: The filter is well-constructed, featuring a sturdy design that feels durable. The compact size makes it easy to fit in tight spaces, especially in my cabinet. The integrated heater is a game-changer, eliminating the need for an additional heater in the aquarium. Ease of Installation: Setting up the Thermo Biomaster was straightforward. The user manual was clear, and all necessary parts were included. The quick-release valves make it easy to detach the filter for maintenance without creating a mess. Performance: This filter provides excellent water clarity and quality. The three-stage filtration system (mechanical, biological, and chemical) works effectively to keep my tank pristine. The adjustable flow rate allows for customization based on the needs of my aquarium, which is a nice touch. Though I keep the flow rate fully open. Heater Integration: Having a built-in heater is incredibly convenient. It maintains stable temperatures, which is essential for aquatic life. The heater is reliable and adjusts quickly to changes, ensuring a comfortable environment. Maintenance: Maintenance is a breeze with the easy-access filter media trays. I appreciate the reminder for maintenance intervals, which helps me stay on top of cleaning without guesswork. Noise Level: I found the noise level to be minimal, especially compared to some other filters I've used. Conclusion: Overall, the Oase Thermo Biomaster 250 is an outstanding canister filter that combines effective filtration with convenient heating. It’s perfect for aquarists looking for a reliable solution for their tanks. I would highly recommend it to anyone looking to enhance their aquarium setup!

## Features

- THE MOST CONVENIENT CANISTER FILTER ON THE MARKET – The BioMaster's EasyClean Pre-filter module can be removed separately from the rest of the filter. This makes maintenance fast and simple. It also increases filter efficiency and extends the life of main filter foams.
- BUILT-IN HEATER - Houses heater to minimize in-tank equipment, while also protecting inhabitants from direct contact. Temperature controlled via bi-metal technology with a thermal shutoff for safety. Adjustable between 66°F - 90°F with a secondary knob for fine-tuning within +/- 2°F.
- CLEAN, CLEAR, HEALTHY WATER – Engineered with 4-stage sealed filtration pathways, this filter ensures water travels the most efficient path through activated carbon foams, filter foams of differing pore densities, and Hel-X Biomedia – all providing ideal surface area for beneficial bacteria settlement.
- BUILT-IN SAFETY FEATURES - Designed with safety locks on the handle, pre-filter, and aquastop to avoid spills during maintenance. The aquastop is detachable for easy movement of the filter without affecting the tubing setup.
- QUALITY DESIGN – Made in Italy, with German engineering from OASE and backed by a 4-year warranty (3 + 1 year with online registration). Includes all the necessary fittings for your setup: intake tube with inlet strainer, water distributor nozzle, spray bar, inlet adapter and outlet adapter with flow control, tubing, fittings, heater adapter, and 6 ft. power cords (one cord for filter, one cord for heater).

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07LHD941X |
| Best Sellers Rank | #126,534 in Pet Supplies ( See Top 100 in Pet Supplies ) #2,135 in Aquarium Filter Accessories |
| Brand | OASE |
| Brand Name | OASE |
| Capacity | 70 gallons |
| Color | Black |
| Customer Reviews | 4.3 out of 5 stars 301 Reviews |
| Efficiency | High |
| Flow Rate | 250 gpm |
| Global Trade Identification Number | 00706759551489 |
| Heat Output | 150 watts |
| Included Components | Aquarium Filter with heater, filter media, tubing, intake and outflow tubes, diffuser, spray bar, fittings, and power cable |
| Item Depth | 14.6 inches |
| Item Dimensions W x H | 9.4"W x 14.6"H |
| Item Type Name | Filter |
| Item Weight | 11.5 pounds |
| Manufacturer | OASE |
| Manufacturer Part Number | 55148 |
| Manufacturer Warranty Description | 3 year limited + 1 year warranty extension with online registration |
| Maximum Pressure | 2.86 psi |
| Maximum Temperature | 90 °F |
| Model Number | 55148 |
| Mount Type | Floor |
| Number of Items | 1 |
| Power Source | ac_dc |
| Product Dimensions | 9.4"W x 14.6"H |
| Special Feature | Adjustable flow control is built into the inlet and outlet of the filter, The EasyClean prefilter module can be removed separately from the rest of the filter for simple cleaning and to extend the life of your filter, The sealed filtration pathway allows you to get the full benefits from all 4-stages of filtration Special Feature Adjustable flow control is built into the inlet and outlet of the filter, The EasyClean prefilter module can be removed separately from the rest of the filter for simple cleaning and to extend the life of your filter, The sealed filtration pathway allows you to get the full benefits from all 4-stages of filtration See more |
| Special Features | Adjustable flow control is built into the inlet and outlet of the filter, The EasyClean prefilter module can be removed separately from the rest of the filter for simple cleaning and to extend the life of your filter, The sealed filtration pathway allows you to get the full benefits from all 4-stages of filtration |
| Style Name | Biomaster Thermo 250 |
| UPC | 706759551489 |
| Unit Count | 1 Count |
| Voltage | 120 volts |
| Wattage | 165 watts |

## Product Details

- **Brand:** OASE
- **Capacity:** 70 Gallons
- **Power Source:** Corded Electric
- **Product Dimensions:** 9.4"W x 14.6"H

## Images

![OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering - Image 1](https://m.media-amazon.com/images/I/71ooVApRXkL.jpg)
![OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering - Image 2](https://m.media-amazon.com/images/I/61cwtUdJpVL.jpg)
![OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering - Image 3](https://m.media-amazon.com/images/I/71GhvYmH9yL.jpg)
![OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering - Image 4](https://m.media-amazon.com/images/I/81iV5-raLqL.jpg)
![OASE BioMaster Thermo External Filter with Built-in Heater for Aquariums up to 70 gallons, Multi-stage Filtration, Easy Maintenance Prefilter, Quiet Canister Filter, German Engineering - Image 5](https://m.media-amazon.com/images/I/71VA0JixhvL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: My unit is constantly purging air. Is there a solve for this issue? I recently bought mine just a week ago.**
A: It is Amazing to me how Oase will not admit they have a problem with their Biomaster line . I have dealt with Douglas Ward ,President at Oase and Factory rep.
Adam Raabe
Aquatics Category Manager (North America)
Both of them will not acknowledge there is a purging issue . If you look at the design of the filter you will find that whether  it is the 250 or all the way up to the 850 they all use the same head unit all that is different is wattage and impeller  . Foot print of the the whole biomasters is also the same except for height of canister . From my own personnel experience Biomaster 250 has no purge issues . Biomaster 350 for me purged from day one when I got it in 2019 .Biomaster 600 purged right from Day 1 and is still purging with new head unit and also larger diameter pre filter pipe with 3 times as many holes
than stock . Also coarser pre filter sponges . If you look on line it looks like Biomaster 850 is even worse . Where I am going with this is that the whole basic design is built around dimensions of a lesser flow filter and there in lies the problem . All the silicone in the world on orings will not help the issue . When I took the impeller from the 350 and put it in the 600 head the purging lessened ,still there but less frequently . What I have found is the problem is cavitation inside the housing and trying to get more flow from the filter with the same basic dimensions is what is the cause . Simple hydraulics . Where the impeller sits inside the head is the same size no matter what biomaster you have ,I know this because I have the 250.the 350 and the 600. When you call oase they will try to tell you that is you put a pre filter sponge on the inlet tube in the tank it will cause a restriction and you will have purging BS!!! I am using a very fine sponge on the inlet tube of my biomaster 250 (it is in a shrimp tank) and I have let it go until that sponge was caked in mud and had NO purging ,even when I shook the sh!t out of the filter. The design of the Biomaster line is made for the 250 and the 250 alone . It's no secret there is an issue with that filter . I have an Ehiem 2217 since the 1970's and Two Fluvals 07 series . I have been in the hobby now for approximately 60 years and I have owned many filters over that time going back to the leather belt drive piston air pumps and the old Supreme hang on back filters ,I know something about filters. Oase knows they have a bad issue but does not know how to fix it without getting rid of the 350 ,600 and 850. To conclude here is a little tip ,get yourself a smart switch ,something like a Kasa . Set it up with a schedule where it switches off at least twice a day for a few minutes and comes back on . What will happen is that it will do a purge when it comes back on that will lessen the frequency of purging throughout the day . What you would be doing is what Fluvals FX built in feature does to purge built up air in filter . Unlike Oase Fluval needs only one on off per 24 hours . Smart switch will not cure problem but will lessen the purge issue considerably .

**Q: hi I’m having trouble with this filter. It’s taking in air and  it’s starting to make weird noises. who can I contact for warranty help? Thank you :)**
A: Hello. We are sorry to hear that you are having an issue with your BioMaster Thermo 350. You may contact our Customer Care Team Monday through Friday between the hours of 8:00AM- 6:00PM ET. Our Team looks forward to assisting you!

**Q: Does the heater have its own power source? In other words is it independent of the filter. I want to be able to hook the heater to a temp controller.**
A: Hi, The built-in heater provides your aquarium with precise and uniform temperature levels with adjustable control. The heater is on a separate power cord from the filter. Hope this helps!

**Q: does this come with activated carbon foam/media?**
A: Hi, I purchased my biomaster thermo 350 1 year ago and has been running flawlessly ever since. Now, with the stock csrbon prefilters I had minimal purging.... So i switched to the blue 45 ppi and it was much better.... Then I purchase the red 30ppi and I guess 3 times is a charm... No more purging except the first 10 minutes after cleaning them... Then I am good to go for 3 weeks roughly and I will notice a slight decrease in flow and a few light purges which I've come to love. It's a simple reminder.... Hey, clean the prefilter. Do not listen to the ' gunk it with vasoline and buy metal hose clamps. I also have a second 350 and a 250 on my 15 gallon set up. My advice is really take your time conecting the hoses. I use clear hose and lily pipes... So I can't adjust the flow... Am going to get some double taps from oase now that they're available. Lastly, when I switched to the red 30 ppi pre's I notice avery dramatic increase in flow... Hopefully, this helps... I was kinda annoyed at even one purge when I first bought it... But, give it time... Carefully going over each connection. I use no lubricants of any type...just water from the tank... And all filtrrs are set up bottom tral blue stock sponge, all folling trays seachem matrix and top tray stock red foam. Only fill the trays about 3/4th with matrix. Don't stuff it in. The trays might sit uneven and cause issues .....anyway, best of luck...

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best Canister Filter Ever!
*by S***. 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.

### ⭐⭐⭐⭐⭐ Great for Saltwater Reef Tank
*by M***E on October 19, 2024*

The Oase Thermo Biomaster 250 canister filter has truly impressed me with its performance and features. Here are the key points I found noteworthy: Design and Build Quality: The filter is well-constructed, featuring a sturdy design that feels durable. The compact size makes it easy to fit in tight spaces, especially in my cabinet. The integrated heater is a game-changer, eliminating the need for an additional heater in the aquarium. Ease of Installation: Setting up the Thermo Biomaster was straightforward. The user manual was clear, and all necessary parts were included. The quick-release valves make it easy to detach the filter for maintenance without creating a mess. Performance: This filter provides excellent water clarity and quality. The three-stage filtration system (mechanical, biological, and chemical) works effectively to keep my tank pristine. The adjustable flow rate allows for customization based on the needs of my aquarium, which is a nice touch. Though I keep the flow rate fully open. Heater Integration: Having a built-in heater is incredibly convenient. It maintains stable temperatures, which is essential for aquatic life. The heater is reliable and adjusts quickly to changes, ensuring a comfortable environment. Maintenance: Maintenance is a breeze with the easy-access filter media trays. I appreciate the reminder for maintenance intervals, which helps me stay on top of cleaning without guesswork. Noise Level: I found the noise level to be minimal, especially compared to some other filters I've used. Conclusion: Overall, the Oase Thermo Biomaster 250 is an outstanding canister filter that combines effective filtration with convenient heating. It’s perfect for aquarists looking for a reliable solution for their tanks. I would highly recommend it to anyone looking to enhance their aquarium setup!

### ⭐⭐⭐⭐⭐ This might just be the perfect canister
*by J***. on June 14, 2019*

I took a chance as these didn't have a lot of reviews or videos online. I am using this in a mixed reef tank and it could very well be the perfect canister for this situation. 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. I suspect it was still purging some air pockets during this time. But now it is completely silent - no hum, no water noise, nothing. The only way I know its running is to look at the return line and see the water moving out into the tank. 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. I have changed these out to the finer 60ppi sponges which are equivalent to approx 250 micron filters. With the 60ppi sponges I rinse them thoroughly every week but the process of doing so is so simple and quick. 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. I run purigen in the canister so I do have to open it once a month or so to replace and when I do the inside is virtually detritus free. The flow is superb. Inside the canister I have 1/2L of Seachem matrix in the bottom basket, 1/2L of Seachem matrix in the next basket, an empty third basket, and 100ml of purigen in the top. I let the prefilter area handle all my mechanical filtration and try not to cram too much media in the filter to slow it down. With this setup I am pushing 208 gph up 32" to my tank. (measured via an inline digital meter). I connected the heater to my JBJ controller for the first week to verify the accuracy of temperature and it was spot on. It maintains my 48 Gallon tank at a consistent 79 degrees.

## Frequently Bought Together

- OASE Indoor Aquatics Biomaster Thermo 250,Black
- FZONE Aquatic Glass Lily Pipe Set with Skimmer Inflow and Outflow for Aquarium Filter 5/8''(16/22mm) Tubing
- Seachem Matrix, 4 L / 1 gal.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-02*