---
product_id: 97759215
title: "Indoor Aquatics Biomaster Thermo 350"
brand: "oase"
price: "A$762"
currency: AUD
in_stock: true
reviews_count: 5
url: https://www.desertcart.com.au/products/97759215-indoor-aquatics-biomaster-thermo-350
store_origin: AU
region: Australia
---

# 4-stage advanced filtration system Whisper-quiet external filter Integrated heater for precise warmth Indoor Aquatics Biomaster Thermo 350

**Brand:** oase
**Price:** A$762
**Availability:** ✅ In Stock

## Summary

> 🔥 Elevate your aquarium game with flawless warmth and clarity!

## Quick Answers

- **What is this?** Indoor Aquatics Biomaster Thermo 350 by oase
- **How much does it cost?** A$762 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/97759215-indoor-aquatics-biomaster-thermo-350)

## 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

- • **Whisper-Quiet Operation:** External filter runs silently, maintaining tranquility in your living or workspace.
- • **Quadruple Filtration Power:** Biological, mechanical, chemical, and prefiltration stages guarantee pristine, healthy water.
- • **Crystal Clear Views, Zero Clutter:** Compact filter design keeps your aquarium visually stunning and unobstructed.
- • **Seamless Aquarium Climate Control:** Integrated heater ensures consistent, uniform temperature for optimal aquatic life comfort.
- • **Effortless Maintenance & Performance:** All-in-one design simplifies upkeep while maximizing water quality and fish vitality.

## Overview

The OASE Indoor Aquatics Biomaster Thermo 350 combines a compact external filter with an integrated heater, delivering precise temperature control and whisper-quiet operation. Featuring a comprehensive 4-stage filtration system—biological, mechanical, chemical, and prefiltration—it ensures crystal-clear, healthy water while maintaining an unobstructed aquarium view.

## Description

OASEIndoor Aquatics Biomaster Thermo 350

## Features

- The Bio master thermos 350 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

## Product Details

- **Brand:** OASE
- **Product Dimensions:** 9.4"W x 16.7"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
- **Color:** Black
- **Wattage:** 216 watts

## Images

![Indoor Aquatics Biomaster Thermo 350 - Image 1](https://m.media-amazon.com/images/I/71dvHb0YPmL.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

### ⭐⭐⭐⭐⭐ EXCELLENT Cannister Filter with Built-In Heating
*by J***D on February 14, 2021*

I purchased this OASE BioMaster Thermo 350 canister filter on Amazon Prime about a month ago for use with my new 32-gallon fresh water planted aquarium. This canister filter is beautifully designed and engineered in Germany, and built in Italy. This is a VERY high-quality piece of aquarium equipment with several excellent built-in features. I’ve owned aquariums for over 40 years and this is hands-down the BEST canister filter I’ve owned.The pump primer feature is powerful and effective, easy to use, and gets the filter up and operating almost immediately after applying power. The ability to shutoff and remove the 5/8” ID inlet and outlet hoses without spilling any water is an EXCELLENT FEATURE, as is the ability to remove and clean only the pre-filter. The stacking media trays are VERY easy to remove and clean, and allow the use of several different types of filter media. This unit was clearly designed by people familiar with aquarium equipment for people who use aquarium equipment! The built-in heater works great and keeps my aquarium rock-steady at the selected temperature. The pump motor is almost silent with virtually NO irritating vibration. The 5/8” ID hose supplied with the unit is tinted to hide algae and of excellent quality.I give this OASE BioMaster Thermo 350 canister filter my strongest recommendation. While not inexpensive, it works beautifully and is well worth the cost. Please see my photos.

### ⭐⭐⭐⭐⭐ Amazing filter
*by L***A on January 1, 2025*

This filter is crazy quiet, water flow is the best I’ve seen yet. The filter is easy to set up, and seems almost over engineered … I have the spray bar set up to agitate the water surface , you can adjust the angle to suit your preference … Might need to figure out how to get the intake and output brackets, to fit my tank better, but other than I recommend this filter to everyone, anyone and people in between … Best filter I have ever had … Will adjust as needed if anything changes

### ⭐⭐⭐⭐⭐ One of the best
*by J***. on June 11, 2025*

Extremely silent! Super easy to get it going. If I had to come up with a reason to dislike it I could say the tubes are a bit thick so it’s hard to keep them still, but you can replace it. Working great so far!

## Frequently Bought Together

- OASE Indoor Aquatics Biomaster Thermo 350
- Seachem Matrix, 4 L / 1 gal.
- FZONE Aquatic Glass Lily Pipe Set with Skimmer Inflow and Outflow for Aquarium Filter 5/8''(16/22mm) Tubing

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.au/products/97759215-indoor-aquatics-biomaster-thermo-350](https://www.desertcart.com.au/products/97759215-indoor-aquatics-biomaster-thermo-350)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-19*