Do you have continuous power?
If not, you won't be happy with it, because to work as advertised, the fan and heater must run all the time. There was quite a discussion of the Airhead a few months ago, in which Geoff Trott (who owns Airhead) participated. It's in the archives at http://archive.sailboatowners.com/archive/archivepview.tpl?sku=2003025175808.57&forumabr=bb&fno=3&_ptitle=ptitle%20rtitle&_psamp=psamp&&model=none&forum=none&andor=wa&keyword=air%20head&pr=p,r&ssite=HOW&srt=none&start=4&max=20I think you'll find it interesting reading. I also suggest that you go the Airhead website at http://www.airheadtoilet.com