Our experience with the Envirolet toilets was terrible. We got the most expensive vacuum flush kind (low water, AC).
The composting system failed in numerous ways - poop fell right through to the bottom of the box, heaters on the boxes drew too much power and tripped our circuit breakers and we'd come out to find the things not running at all.
Also we didn't discover until after we got them that the bulk of "Envirolet system" is actually a Dometic RV toilet and pump. The only part of this overpriced system that's made by Envirolet is the composting bin, which is just a plastic box with a rake, fan, and heater inside. That accounts for the bulk of the price and that's the part that's defective. Obviously, if you're buying a composting toilet you're using it in a place where only a composting toilet will do.
We tried to dispute the charge with our credit card company, but Envirolet insisted there's nothing defective about it - even though it has failed in numerous ways.
On top of the issues with the composting bins, the toilets themselves are very finnicky. It's common to have the pumps run and run and run and run, and finally overheat. This seems to happen because the "plug" in the bottom of the toilet bowl doesn't form a good seal, which can happen any time some toilet paper or something gets caught in there. It's easy for this to happen because of the low water. The only way to consistently reduce the incidence of this problem is to use more water, but that also defeats the purpose of having a super eco-friendly, minimal water toilet.
We eventually had to just take the compost bins out of the system and replace them with a holding tank, which made the whole thing a giant waste of money.
Stay away from Envirolet toilets. They just don't work, and the company's customer service is horrendous.
If you just search around for "Envirolet reviews" you'll notice that the positive review above mine seems to be the only good review in existence.
