Exaco Logo

Aerobin 400 Compost Bin - Our Best Seller!

Aerobin 200 Composter graphic

The First Composter Which Requires No Extra Work - No Turning Required

The Aerobin 400 uses a patented lung® or aeration core inside a sealed bin to promote aerobic break down of organic matter, which experts say is the preferable method to reduce greenhouse gas emissions.

The thermal insulation in the Aerobin 400 conserves heat, leading to rapid breakdown of the biomass and works efficiently year round, even in cooler regions. There is no need to turn the biomass and it is pet and rodent resistant. It has little odor and can kill noxious weeds and seeds. It is BPA free, constructed from virgin PP(Polypropylene) & HDPE (High-density polyethylene) - it’s a 80/20 blend

The Aerobin 400 is easy to use - just open, drop and close. After a short time, fertile compost is produced, which is easily accessed via the lower side door.

The Aerobin 400 comes with a reservoir at the bottom to collect the leachate, which when diluted makes for great "compost-tea" liquid fertilizer. Now includes an updated hose and tap for 2021, see video below.

DEALERS:  Scroll to the documents section at the bottom of this page for informative, printable Aerobin 400 promotional materials

Additional Images and Information

Click to display more information and larger image

aerobin 400 composter
aerobin 400 composter features diagram
aerobin 400 airflow diagram
outdoor photo aerobin 400
aerobin 400 outdoor photo
close up aerobin 400
white background aerobin 400 compost bin
lid open white background aerobin 400 compost bin
leachate collector spigot
Aerobin 400 in the wild
Aerobin 400 2021 hose & tap system

Aerobin 400 Features

  • Capacity: 400 liters, 113 gallons.
  • Insulated side walls and lid for year round operation - both to retain heat generated by the aerobic composting process and stop cold ambient air reaching the biomass.
  • It has a base and a Leachate Tank for collection of liquid nutrients dispelled from the biomass (green waste). NOTE: updated hose and tap system for 2021, see images and video above.
  • No turning or agitating of the biomass is necessary - simply drop and forget!
  • BPA Free - constructed from virgin PP(Polypropylene) & HDPE (High-density polyethylene) - it’s a 80/20 blend
  • Aerobin requires no accessories or tools.
  • It's vermin resistant.
  • Aerobin composts kitchen & garden waste quickly.
  • Moisture recirculation system.
  • Aerobin lowers GHG emissions.
  • Designed in Australia
  • Manufactured in India


  • Suggested Retail: $349.99
  • Size of Article (L x W x H): 29" x 29" x47"
  • Net Weight: 56 lbs.Single Packaging - boxes: 2
  • Kind of Packaging: Brown cardboard
  • Kind of Palette: 40" x 48"
  • Size of Master Carton box 1: 9.7" x 29.5" x 29.3"
  • Size of Master Carton box 2: 22" x 28.8" x 25"
  • Weight box 1: 23.7 lbs
  • Weight box 2: 49.5 lbs
  • Shipping quantities: Qty per 40' HC - 175 unitsUPS/Fedex Shippable

Pro Tip: Additional Strength Reinforcement Aerobin 200

If you have the Aerobin 200 (smaller version of the 400) you can easily add some additional strength reinforcement to the sidewalls of the unit by adding a self-tapping screw to the corner braces. This step is not required by the factory, but will help with the overall stability of the unit. See images below as a guide. You may also download a printable instruction sheet.

You may also view the Aerobin 200 Assembly Video completely before starting assembly, so that you'll have an idea what all the parts are for and what to expect. It's Easy!

aerobin 200 corner brcing for stability pic 1

aerobin 200 corner brcing for stability pic 2

We purchased an Aerobin 400 from Costco some months ago, but only recently put it up. As I was browsing the assembly instructions online, I noticed that the updated model now featured a hose and tap to collect the tea. So I wrote to Exaco asking if I could purchase the hose and tap so that I could use it on my older model.

I was pleasantly surprised when Claudia from customer service reached out to let me know that Exaco would be more than happy to send me one for free.

So this is just a note to thank Claudia and Exaco for exceptional customer service. The Aerobin has just commenced operations and I am hoping for some excellent compost a few months from now.

But, thank you once again.

Anu W | 5/21/21

Generally good quality.

Unfortunately several of the tabs which are required to snap the sides in place were broken off on arrival. I had to use machine screws to secure the sides together. There should really be better quality control on such an important part of the unit prior to packaging. Looking forward to seeing how it performs.

Dan | 4/19/19

Hi Dan,

I am sorry your Aerobin arrived with damaged parts. We will gladly replace any parts for you that may be broken during shipping. Please let us know if you need anything at all.

Customer Support
(512) 407-8500 Ext 701

I have the Aeorobin 400composter for a little over a year now and like it very much - except that I can't open the 2 doors to harvest and utilize the mature compost. I had approached a number of people to help me out, no one was able to do it. I will appreciate if you can help me out. Also, were can I buy the "hose and tap" in order to use the compost tea. I will appreciate all the help you can extend. Thank you in advance!

Selah LaBarbera | 7/5/21

Hi Selah,

I am glad you are liking your Aerobin composter! When the compost is left to mature for an extended time, it can get compactd down. This, paired with the leachate liquid drying at the edges can cause the bottom access doors to get “stuck”. Here is what we recommend to get at all that great compost:

  • Keep in mind that that bottom access doors are in a locked position. To open them, you need to pull directly up on the handle and then out once the bottom lip clears the edge of the base.
  • If heavy, mature compost has compacted behind the door, the best way to loosen it up so you can move the door upwards is to create a lever. You can do this by placing a block of wood or a brick next to the Aerobin and then insert the tip of a shovel into the crevice at the bottom of the access door – then push down the shovel handle using the brick as the block for your lever. Once the bottom has cleared the lip of the base, pull it outward.
  • Once the access doors are removed, use a hand rake to carefully remove the finished compost, working around the interior lung system.
  • Replace the doors
  • Gently add pressure to the biomass at the top of the bin and it should fall into the bottom.

Please let me know if you need anything else.

Thank You,
Customer Service

Is it manufactured in North America?

Christina Vander Meer | 6/8/21

Hi Christina,

Thank you for reaching out. The Aerobin is made in India.

Please let me know if I can be of further assistance!

Thank You,
Customer Service

Is the bin BPA free (or free of similar unhealthy compounds)?

RJ Long | 6/2/21

Hi RJ,

Aerobin is a BPA free product.

The polymers used in the manufacture of the Aerobin are a compounded blend of virgin PP(Polypropylene) & HDPE (High-density polyethylene) - it’s a 80/20 blend.

Thank You,
Customer Service

Where is the best location around the home to place the Aerobin 400? And how far away from house entrances or foundation? Should it be placed on concrete, on blocks, or on the ground itself? Thank you for your reply.

Ron Roa | 3/22/21

Hi Ron,

Thank you for your interest in our Aerobin composter! It is best to place the Aerobin on a firm, level surface, so pavement or pavers/bricks is a good option.

It does not need to be placed in the sun as the heat is generated from the inside. It is best to place it in a convenient location for you to make composting easy and convenient.

However, if rodents are prevalent around your area, preventative measures should be considered

  • Locate the Aerobin in an area where there is as much people traffic as possible – Rats/Mice do not like being disturbed – so the more sheltered the location the more aggressive rodents can/will be.
  • Don’t position the Aerobin close to a fence line – it provides a sheltered cavity between the fence and the Aerobin

Thank You,
Claudia, Customer Service

Hi, I was wondering where your Aerobin composter 400 product is made. Thank you!

Jennifer Duggan | 2/27/21

Hi Jennifer,

The Aerobin is made in India. Please let me know if you need further assistance!


Claudia, Customer Service

Hi, I need to move home and can I ask what’s the best way to take apart the aerobin400 and put it back together again? And would u recommend that I leave the residue in or empty it out if I move the compost without taking it apart? Thx Ada

Ada Loi | 1/25/21

Hi Ada,

You can take apart the Aerobin by following the steps in this YouTube video.

Depending on how much space you have to move it – you could keep it together, but I’d highly recommend removing any compost and liquid leachate that might be in the bin to avoid a terrible mess while you are moving it.

Please let me know if you have any other questions.


Claudia, Customer Service

Will the Aerobin work in freezing temperatures?

C.H. | 8/24/20

Please note Aerobin will keep composting at sub zero temperatures – but it will reach a point when the biomass will freeze over. When the Winter passes and ambient temperatures increase, the biomass will thaw out and the process will start again. However the more ingredients that you offer up to the Aerobin the more chance of the biomass remaining hot and fighting off the ambient cold weather.

Aerobin has insulation in the Lid & Walls that works both ways – it helps to keep heat in – as well as keeping heat & cold out.

My Mothers Aerobin is over 2 years old and has not yet produced compost. What are we not doing? It is in the sun with a Southerly exposure for most of the day. Thanks!

Rose Raggio | 8/12/20

Hi Rose,

Four key factors affect composting: Airflow, temperature, moisture, and the organic material added to the bin. Aerobin takes care of airflow and temperature. Adding organic waste and moisture level is usually where things might go awry.

Getting a good mix of organic materials – browns and greens may be the issue. Aerobin has a compost simulator on their site here that may help you determine if you have the correct mix. This document might also give you a good idea of what and how to add materials.

Another common issue I’ve seen is that the material in the bin is not moist enough – it should be as moist as a damp sponge. Sometime too many dry brown items are added and there is not enough moisture for the microorganisms to do their job. This is something I would recommend checking.

I have also spoken with customers that have compost and did not realize it as they were expecting soil – but compost won’t look like soil coming out of the Aerobin.

If you want, you can open the bottom access door of the Aerobin and send me some photos of what’s inside. I might be able to help diagnose based on the photos.

Additionally, the manufacturer’s site at www.aerobin400.com has a lot of resources – look for the tab that says “info & resources” and “composting with aerobin”.

Thanks! Claudia/Customer Service

Hello. How much sun does the Aerobin need to effectively compost? I have a mostly shady area where I was originally planning to locate it. Would this not be effective? Thanks!

Cathy Gennaro | 7/20/20

Hi Cathy,

The Aerobin does not need to be in the sun. The heat for composting is generated from the microorganisms INSIDE the composter as they are breaking down the matter. So your spot sounds perfect!

Please let us know if you need anything else.

Hello, we have recently purchased and set up our Aerobin 400 in our yard. We replaced our older composter with this new one. I noticed the instructions say to not put the composter on bare ground, but instead to place it on cement or some other hard surface. Is this to prevent the composter from sinking into the ground when it gets full and heavy? Or is there another reason? We had a prior composter in this same spot for years without issue on bare ground, so we were just wondering. Thank you.

Todd Kruse | 6/30/20

Hi Todd,

Thank you for your purchase of an Aerobin. Yes, the reason it is suggested to be on firm ground is exactly that. If you purchase some tubing to place on the leachate nozzle and leave it in the open position, it will be much more workable.

Please let us know if you need anything else.

How do you remove the solid material from the bin?

John Hamilton | 6/29/20

Hi John,

Thank you for reaching out. There are 2 bottom access doors from which to remove the finished compost with a hand rake. To remove the doors, first – pull them up by the handle and then out. Once you have removed the finished compost, replace the doors and gently push down on the unfinished compost from the top until it settles into the bottom level.

Please let us know if you need anything else.

Is the 13 mm tube the interior dimension or the outer dimension? I have a 5/8 in OD with 1/2 in ID.

Misti French | 5/27/20

Hi Misti,

Thank you for reaching out. I think you are referring to the optional tube that you can add to the leachate tank. A 1/2" inner diameter tubing will work great. You should be able to buy this by the foot at any home improvement store.

I just purchased the Exaco Aerobin 400 - it will arrive in a couple of weeks. It says you can compost “noxious weeds.” Can you compost things like poison ivy and lily of the valley in it? Lily of the valley is poisonous if ingested, and poison ivy is not something I’d want to spread around.

In theory, most of plants’ leave and stem are good source of nitrogen, so they can be composted. Perhaps not putting the root/seeds of these plant due to they are noxious.

For weeds & seeds to be killed during the composting process, the operating temperature needs to be high +40Deg C – which will only be achieved if the composting effort is optimized.

The Aerobin trials were run and observed at Swinburne University in Melbourne. The inputs were largely “greens” from the greengrocer, lawn cuttings and some newspaper/balled and office paper – shredded. The temperature readings that were obtained over Summer only got to 35Deg C. The trick is getting a sufficient loading of moisture in the mix, with a target ration of 70:30 – wet:dry material or nitrogen:carbon. It should also be a mix rather than large masses of very moist material in isolation to the dry material.

We had feedback from Japan during January (which was still winter there) and one Aerobin being operated by something of an expert in the field of composting and had reached temperatures as high as +60Deg C – the biomass was largely organic food waste from his home and “greens” waste from his fairly large vegetable garden – but it was the combination of wet & dry materials that yielded the results that he was getting.

So to conclude, the temperature is the key factor to determine if mentioned noxious plant can be fully composted or not. To achieve the ideal temperature, consumer should follow mentioned above.

Thanks, Claudia - Customer Support (512) 407-8500 Ext 701

Hello, i live in Ohio, Us and saw the product for sale. Curious about temperatures in winter time. Here can get -15-20 celsius in winter time. Can the item be left outside during winter. Would still work during winter period?

Cris Donoso | 4/27/20

Hi Cris,

Thank you for reaching out. The AErobin 400 will hold up to the cold temperatures and the built in insulation does help keep in the heat generated so it will process further into the colder weather. However, during this cold weather, the microorganisms will slow down their decomposing. When it gets extremely cold it is likely to stop. However, you can continue to add scraps of greens/browns and it will begin again when the weather warms up.

Thanks, Claudia - Customer Support (512) 407-8500 Ext 701

Bin is full. What is the best way to open at the bottom. Bin is full and having difficulty opening access door at bottom. Thanks.

Joan Hogan | 4/6/20

Hi Joan,

Thank you for reaching out. The doors at the bottom push directly up first and then pull out. Sometimes the compost compacts down and makes it difficult to open the access door. The easiest way to release it is to use a shovel like a lever - insert the tip of the shovel between the door and the base. Place a brick or rock under the shovel head so you can push down on the handle. This will push the tip of the shovel up (along with the door). While it is up, pull it out by the handle.

Please let me know if you have any other questions.

Thanks, Claudia - Customer Support (512) 407-8500 Ext 701

I live in western NY where the winters can be cold and long. Can the aerobin 400 or 200 continue to work outside under those conditions? What if I put it in a detachedI insulated garage?

Mary E. Lanzafame | 8/13/2019

Hi Mary,

Thank you for your inquiry. The Aerobin is a great composter to be looking at for your climate, although we do only carry the Aerobin 400 at this time. The composting process does produce its own heat due to the activity and digestion by the microorganisms, so it does not rely on outside temperature. However, during colder months the microorganisms do slow down and decomposition and heat in the pile will also slow down. The insulated sides will help to retain some of the heat to keep the activity going for a while during freezes though. During this time you may continue to add your kitchen scraps to your pile – when it warms up the pile will begin to be active again.

Aerobin uses an aerobic process which means plenty of airflow is required, and if kept indoors a composting odor may be evident, so it should be kept outdoors. If kept in your insulated garage there is the possibility of attracting some pests an you may see some of the leachate along the floor occasionally.

Please let me know if you have any other questions.

Thanks, Claudia - Customer Support (512) 407-8500 Ext 701

I wanted to see how high off the ground this needs to be? I currently have this on 2x4’s on the grass, but not sure if that lets enough air underneath. Thanks

Erik Keenan | 5/1//2019

Hi Erik,

There are vents at the bottom which will allow enough air in, even when it is placed on the ground.. It can be helpful to raise the bin up slightly however to be able to adjust the leachate tap.

Thanks, Customer Support.

Can the Aerobin 400 be left in the sun without damaging the bin or is shade required?

Michael Amato | 7/9/2018

Hi Michael,

Due to the unique high design with the double insulated walls the Aerobin composter does not need to stand in the sun (to get warm) – it will work very well in the shade. As such it is recommended to place the Aerobin not in direct sunlight – the less direct sunlight one has on a plastic container the longer the container lasts. In direct sunlight I expect the Aerobing to last at least 10 years but in the shade it will be double that.

Thanks, Customer Support.

I love my aerobin and it's served me well through my first season. You mention on the site that the leachate can be diluted and used as fertilizer. What ratio of water should I use to dilute it?

Jessica | 12/16/2016

Hi Jessica,

The standard ratio is 10 to 1 (10 x more water).

Thanks, Customer Support.

Back To Top