The Clivus Multrum™ - CM HP system is designing to meet the larger capacity requirement of a few users to a family unit with a chamber (tank) underfloor-clearance requirement of 750 mm
The Nature Loo™ - Alectura Premium system is a specialized design for tiny homes with a low underfloor clearance requirement of 500 mm, making it very suitable for transportable housing and most retro installations. This composting toilet model is suitable for a couple looking to install a composting toilet in their tiny house.
If you’re in a situation where you need to be off-the-grid and completely self-sufficient, then this is the Sun-Mar model you want to look at. The Excel NE model was first designed in 1981 and still today it remains the standard-setting unit for completely non-electric composting toilets.