Ian Streten wrote:
*At present the favoured position is on the bulk head behind the heads in the engine room.
*As long as you're asking here I'll answer here.* The adminstrators can move the discussion if they want to.*
One of the holding tanks on our boat is in the engine room in bilge between the engines and under the floorboards.* It's a 40 gallon tank and this seems to be a very logical place for it.* The plumbing run to get from the forward toilet to the tank is not all downhill but the pump on the toilet does a good job of pushing material through to the tank and the plumbing itself is made of non-permeable tubing.
Assuming the location you are considering in your engine room is convenient for installation and repair or servicing, it would seem to me it should work well.
Based on our experience and the advice of Peggie Hall, the boating world's resident expert on sanitation systems, I would suggest you go with a one-piece molded tank as opposed to a built-up tank that has seams.* If the space is irregular in shape it may require a built-up tank to fit.* But it sounds like a rectangular or square tank would fit in the space you are contemplating.* Most molded holding tank manufacturers offer a variety of shapes and sizes so you should be able to find one that will fit the space you have.
And whatever you do, don't use a metal tank.* Any metal, including stainless.* The contents of the tank will eventually eat at the metal and pinhole it.* Our boat had a stainless holding tank in the lazarette so we know about the pinholing.* We replaced it with a one-piece molded plastic tank.
-- Edited by Marin on Saturday 3rd of March 2012 02:13:17 PM