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Holding Tank Recommendations

  • Thread starter Thread starter Bob Bradley
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Bob Bradley

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Apr 12, 2005
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3,660
Hatteras Model
43' CONVERTIBLE-Series I (1978 - 1983)
I made the decision to replace my Vacuflush system with a Raritan Elegance toilet. I completely rebuilt the system 4 years ago when I bought my 45. It stopped flushing last November as I was winterizing the boat, and I finally dug into it today. Well, the vacuum pump has waste sitting on top of the bellows, and I'm not interested in going through it every 4 years, so it's going.

That gives me the opportunity to also replace the holding tank. Someone previously converted the original 140 gallon Hatteras holding tank to be a diesel reserve tank. I'm fine with that, as I fish offshore, and there's no such thing as too much fuel. That said, I measured the existing tank, and its external dimensions are 10" deep x 8" tall by 32" long. That works out to be about 10 gallons - clearly not enough. I have room for 12" deep by 28" high by 36" long, or approx 50 gal. The trick is going to be finding one with those dimensions. Anybody have any recommendations?
 
If you go aluminum, you can have a custom tank made in any size and configuration.
 
If you go aluminum, you can have a custom tank made in any size and configuration.

I would not recommend using aluminum for a black water tank. Plastic fabricators will also make any shape polyethylene tanks, but they won't be seamless.
 
You can also have stainless custom made but it will be heavier. I am not sure if the original waste tanks have baffles but that’s something to think about
 
On a previous boat I used a tank from Trionic and installed the fittings where I wanted them using their supplied kit. https://trioniccorp.com/products/holding-tanks
You could also try Ronco. Both companies have a variety of tank sizes and shapes to choose from. I was told to stay with rotomolded tanks, preferably with a 3/8" wall, as a friend in the boat repair business had experienced failures of seams on plastic welded tanks.
 
I would not recommend using aluminum for a black water tank. Plastic fabricators will also make any shape polyethylene tanks, but they won't be seamless.

Why not?
 

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