The Raritan PH SuperFlush is current version of Raritan's tried and true PHII, which has remained the top rated manual toilet pump since Raritan introduced it in 1983. It would be an excellent choice to replace your Headmate.
However, any marine toilet and holding tank along with all its necessary plumbing not only requires considerable maintenance, but uses up a LOT of valuable storage space on a 27' boat...so I have an idea for you:
On any boat much smaller than about 30' a self-contained system—an "MSD" portapotty--makes a lot of sense. The "MSD" designation in the model name/number means it has fittings for a pumpout line and vent line, and is designed to be permanently installed (actually just sturdier brackets than portables, so you could still take it off the boat if you absolutely have to), which means that although it's still called a PORTApotty, you don't have to carry anything off the boat to empty it. And because it's a "pumpable" system, it's legal in Canadian waters too.
A 5-6 gallon model is household height and holds 50-60 flushes...you'd need at least a 30 gal tank to hold that many from any marine toilet. No plumbing needed except a vent line and pumpout hose--and you already have a deck pumpout fitting and vent thru-hull-so no new holes in the boat...and -0- maintenance needed except for rinsing out the tank--which you can do with a bucket while it's being pumped out. Total cost including the pumpout hose and vent line (which should be replaced anyway if it's anywhere near as old as your toilet) is about $300--a fraction of what you'd spend for toilet, tank and all the related plumbing needed. And the best part is, you have all the advantages of a toilet and holding tank without giving up a single square foot of storage space.
A lot of sbo.com members who have smaller boats have MSD portapotties and love 'em. If this idea appeals to you, check out the Dometic/SeaLand 975MSD.
--Peggie
