The Sun Mar Marine Composting Toilet has been a great success for us. We installed it on our 9 metre Catamaran on which we live for about 7 months of the year. Our installation space was extremely tight (1 metre by 1 metre) which also includes a wash basin and the boats electrical control panel, however it works extremely well without any toilet smells. It does require a 12v supply to provide power to its evaporator heater and filtered air extract system and for this we installed a separate 120amp leisure battery with charging from our twin engine alternators. Environmentally, with no discharge into the sea, it provides convenience and practicality in the management of human waste. It provides toilet use in marinas and canals without holding tanks and the normal human waste disposal problems. Ideal for 2 people (manufacturer rates it at one person – editor) and with an easy to empty composting drawer, the ability to use normal toilet paper and the lack of toilet smells gives it a Five Star rating from us.