I'm building a house within the city limits of Bloomington, Indiana and so have to follow all of their codes, which outlaw the simple bucket composting toilet methods and require a sewer/septic hookup to every house. I'm working on getting around this requirement by trying to convince them of the 'approved' composting toilets like the ones made by Sun-Mar. They are much more expensive and fancy than we need or want, but if it means they'll let us avoid the cost of sewer/septic, it actually works out as a gain ... oh the frustration of building in a city.
Anyway, does anyone have experience with these and their venting systems? It appears that there is a fan running 24/7 sucking air through the toilet outside, which would be a huge waste of heat in the winter (we're trying to get as close to 100% passive solar as possible). Is this true? If so, is there a way to avoid all of that heat loss? Perhaps there are other 'official' composting toilets that don't have this 24/7 fan requirement?