Our '77 h27 has a portapotty rigged with a pump-out on deck. This is a legal, and very effective solution:
- it pumps out just like a holding tank.
- because we use no or minimal flush water, it has similar capacity to a 12 gallon holding tank - 4 to 5 days for two of us.
- proper use of Odorlos oxygen treatment eliminates odor.
- the simple design means that there is next to no maintenance!
The installation sounds like yours except there is not a tee to an overboard thru-hull. I believe that must be sealed in the shut position to use in the US.
David,
I heartily agree. When I downsized from a Catalina 30 to my Ericson 26-2 a year ago, I went with a Thetford 550P MSD portapotty. It has a built-in 5.5 gal. tank and it is plumbed for overboard discharge through a macerator for when I am more than 3 miles offshore.
The actual working capacity of this is greater than what I had on my Catalina 30, which had a conventional 14 gallon holding tank. That's because of the large amount of flush water needed with a normal head/holding tank, as you noted. So, on my single handed trips to Catalina, I could go about 5 days or so on the C30 before I had to think about dropping the mooring and motoring offshore to dump. With the porta potty on the E26 I can get by for 6 or 7 with no problem.
I have no issues with odor, either. Plus, the thing is so simple there's really nothing to maintain. It does have a pump to rinse the bowl from the built-in fresh water reservoir, but there's nothing to service with that. Worst case, I'd just unlatch the thing from the platform in the head, toss it in a dumpster, and latch in a new one. But again, the thing is essentially just a glorified bucket so what's there to go wrong?
The one complaint I did have about the Thetford is the exceedingly flimsy plastic mounting bracket. Old Skool Neil, a friend of mine who posts here occasionally, designed a sweet stainless latch that he had a metals fabricator friend of his work up. This holds it securely and makes for easy removal. But just a heads up (pun intended) that if you did buy one you should think about a better bracket.
Here's a link to the model I have:
http://www.thetford.com/HOME/PRODUCTS/PortableToilets/PortaPotti550PMarine/tabid/884/Default.aspx