Best Composting Toilet for Tiny House

The best composting toilet for a tiny house can be a convient installation that feels more like a traditional toilet. You don’t want a temporary bucket that needs emptying all the time. Instead good compost toilets should break down and compact material over a long period of time so you can enjoy your tiny home without a rather unpleasant chore list.

Sun-Mar Compact Self-Contained Composting Toilet

The Sun-Mar compact iteration of this compost toilet is honestly one of the better options specifically for tiny houses. Obviously you already don’t have a ton of space in your tiny house, but you won’t need that space for a Sun-Mar Compact, and a water flush toilet usually takes up too much space.

It’s not as ideal for people who want a little more security because this compostable toilet doesn’t require piping or hose hook ups to function. However this is uniquely one of the sturdier composting toilets, so you won’t have to worry about spilling the human waste and peat moss or tipping left or right while sitting on the toilet or getting up from your seat. 

The composting style of this toilet is relatively good as well. The liquid waste does go into the same compartment as the solid waste and the compost material, which doesn’t use water. However there is a heater that does a great job of evaporating the liquid waste even further than just a normal compost drain which also adds to the odor free possibility of your tiny house composting.

A problem with the heater that is used to evaporate the urine is that it actually creates small, hardened urine crystals that aren’t tough to scrape out, but it’s a little bit of an annoyance when it’s advertised that the majority of the urine simply evaporates. 

This also further gets rid of stench from liquid waste. Since this toilet is regularly in an enclosed place in your tiny house and isn’t meant to be carried outside, you will surely want as little odor as possible. 

There is a vent you can install to carry away the odor as well, and a good idea would be to install it in a high place.

Also, the Sun-Mar Compact isn’t built the best. It sometimes develops cracks in the frame that can lead to the liquid waste especially seeping out. 


  • Liquid waste evaporator
  • Vent
  • Compact


  • No plumbing option
  • Durability

Sun-Mar Mobile AC Waterless Composting Toilet

The Sun-Mar Mobile Compost has some pretty great features that other compost toilets do have, but usually not altogether. 

The finishing drawer, where much of the compost is stored, has a tighter seal than most to prevent any seepage of waste, which is always a possible issue with composting toilets. 

It has a fold away foot rest as well. And for your tiny house, any kind of space saving elements added to your toilet is going to be a plus. Also, the footrest doesn’t get in the way of cleaning or moving the toilet because it has a quick release that provides great accessibility. 

An awesome feature is also the 12 volt fan box that sits in the vent stack. It sits very high up as well, which undoubtedly adds to the low odor that this toilet emits. It’s on its own circuit as well so it really helps if something goes wrong with the electronics and some kind of repair is needed in your tiny house.

While you can easily use this toilet for your tiny house composting toilet, it’s actually built to be tough and as immovable as possible so that it can also be used in an RV. Because of this its super sturdy and tipping or spillage shouldn’t really be a problem. Even though this doesn’t use water, there is still liquid waste that could spill.

It doesn’t need hose or plumbing hook ups, so even with its initially sturdy build, it still may not feel as secure as a composting toilet without those attachments that some other units use for tiny house composting.

It doesn’t have as much storage capacity as some other Sun-Mar models because of its mobile ability, but you still shouldn’t have to take it out of your tiny house and dump this toilet out for at least a month. 


  • Fan is on its own circuit
  • Fold away foot rest
  • Tight seals


  • No plumbing option
  • Low storage capacity

Sun-Mar Excel Non-Electric Self-Contained Composting Toilet

The Excel has a pretty low profile, which may cause some problem for larger or taller people, but for your tiny home, it’s a perfect choice since you are wanting to save as much space as possible while still having a reliable toilet. 

The Excel employs a drain as well so it’s a little closer to a regular toilet, which will probably help guests to feel more comfortable if they are not used to a composting toilet. 

The vent to prevent odor is pretty long and it would be best if you ran it all the way to the roof of your tiny home to get the best odor escape. 

For tiny house installation with this compost toilet, you are definitely going to want to check your dimensions, especially when using compostable toilets. As with the Excel, for the third step of drainage, you’ll have to slide the tray out after a while. If there isn’t enough room to do that, you may have to adjust where you will be putting your toilet. For this particular tray, you are going to need about four feet of clearance. 

The toilet also utilizes a drum that turns the waste and compost to mix them together well. You only really need to turn the drum every couple of weeks if it ends up beginning to smell. Since there is no water, this is very necessary. This will make sure your tiny house composting toilet works smoothly.

Though it does use a drain, it is a little small, so you may have a bit of trouble with it getting clogged. This is why you may need to turn the bio drum crank as frequently as possible to make sure the waste is broken up. 

Though most plumbers won’t deal with compost toilets, especially in a tiny home, you may want someone to help you do the install properly. Compost toilets sometimes have a habit of leaking if not adequately installed. 


  • Low profile
  • Drainage
  • High vent


  • Small drain

Nature’s Head Self Contained Composting Toilet 

Nature’s Head is typically at the top of the queue when talking about compost toilets that don’t use water.

It’s very sturdy, has a high seat that mimics a normal toilet’s height, and has one of the most efficient builds. 

A problem with a lot of composting toilets is that they don’t have the best, sturdiest builds. It’s tough to find a composting toilet that has a sturdy base like that of the Nature’s Head. 

The Nature’s Head compost toilet has a good bit of stainless steel hardware. Most of the screws and latches are made up of this which gives this composting toilet an exceedingly strong frame to be secure in your house.

Comfort is uniquely high and a lot of it has to do with the elongated toilet seat on the Nature’s Head. This seat does a great job of feeling like a regular flush toilet even in your tiny home

It also includes a fan to drive away the bad odors and a vent hose to aid in this process, which is always a plus since your tiny house will have confined spaces that odor can easily fill.

The holding capacity is also one of the largest, so you shouldn’t have to empty out the solid waste and peat moss for quite a while. You should get at least 2-3 months of continuous use out of the Nature’s Head toilet. 

For a tiny house composting toilet, this is the best option for most durable and sturdy toilets that don’t use water.

However, the Nature’s Head is assuredly the largest, possibly most awkward toilet to put in your tiny home. The features make it a wonderful toilet, and also make it less than ideal for a tiny home. The bulk and the weight make it a lot harder to place.


  • Sturdy
  • Comfort
  • Holding capacity


  • Awkward size

Separett Villa 9215 Composting Toilet

The Villa is a very versatile toilet. You can either have it operate on your standard pipeline connected to your tiny home, or it can run off solar and battery power.

It’s fan can also be battery or AC powered, and it supports venting all the way up to twenty feet. This fan does a good job of taking away the odor and drying the solid waste as well. 

The compostable bags are a huge plus as well. Usually you’re going to have to either dump the waste in a separate location, but the preinstalled waste bags collect and retain really well and are usually pretty odor free

It also comes with a toilet seat designed for a child that is easily attachable and detachable for any children living in your tiny home.

The liquid waste doesn’t enter into the compost bag, it diverts to a water tank holding system. This is one of the few compost toilets that uses some form of water.

The big difference in the Separate Villa compared to other composting toilets is that the compost isn’t actually located inside of the toilet. Because of the compost bags, the process you will use will actually take the bag out of the Villa and deposit it outside into the compost there.

This may be a disadvantage especially when living in a tiny home because you may not want to dispose of the waste as frequently as is needed since there isn’t any compost in the toilet. 

Usually you will have to dispose of the waste about every two to three weeks to make sure odor doesn’t build up and it doesn’t attract bugs. This may be too frequent for someone who lives in a tiny home and wants a compost toilet, but doesn’t want to be that frequent in their disposal process. 

A big bonus with this toilet composting process however is that since the liquid, not the solid waste, drains through a pipe you won’t have to remove and carry and then dispose of the liquid waste. This is one one of most precarious activities, especially if you live in a tiny home and have to carry the liquid waste filled bin through your house and outside. It also means that the room will be relatively odor free when it comes to the liquid waste.


  • Liquid separator
  • Versatile
  • Vent and liquid hose to outside


  • Frequent disposal

Buying Guide

Which Toilet Has the Most Features?

Separett Villa probably has the most features that work well for a tiny home. The urine diverting system is huge. Even compared to the Nature’s Head system because in that composting toilet you have to remove the liquid waste holder and dump it yourself. With the Villa the liquid waste diverts to piping that takes it outside for you. 

Also, it ’s circuitry for the fan can be powered by your home, solar, or by battery, which makes this a super versatile composting toilet. 

Which Composting Toilet Has the Most Stability?

The Nature’s Head composting toilet definitely has the most stable structure. It’s height, width, and normal toilet like look and feel all contribute to this. It’s going to be the best composting toilet that mimics a normal plumbed toilet, and your toilets composting processing should be great.

Which Composting Toilet is the Least Expensive

Either the Villa or the Nature’s Head is going to be your best bet if you are looking for a budget but still quality composting toilet. Both run under $1,000 but are among the best composting toilets out there. 


Q: What is the best toilet for a tiny house?

A: For a tiny house, the Separett Villa is going to be one of the best choices specifically for your tiny home. It’s one of the most compact while still being able to ventilate air and pipe out liquid waste without having to carry it out. 

Q: What is the best composting toilet on the market?

A: The Nature’s Head Composting toilet is usually the no brainer if you want a toilet that is solid on all fronts because of its plumbed toilet like look, efficient use, and overall comfort. 

Q: Can I put a composting toilet in my house?

A: Yes. Though oftentimes composting toilets are used in RV’s or on camping trips, your tiny home is a perfect spot to put these kinds of toilets to dispose of liquid and solid waste.

Q: How bad do composting toilets smell?

A: It depends on the toilet, but as long as you have a good ventilation system and take out the human waste in the recommended time for your toilet, it shouldn’t smell. 

Leave a Comment

Your email address will not be published. Required fields are marked *