The hose from the aft head to the holding tank on my Beneteau Oceanis 400 is permeated. It’s a 15 foot run from the Y-valve to a small holding tank installed aft of the aft cabin. I’ve determined there’s room back there to fit a 35 gallon tank without too much angst but the excessively long hose run continues to be a concern.
Alternatively, there’s an alcove next to the toilet that could fit a tank of about 20-25 gallons. This would cut the hose runs to effectively nothing, and I could eliminate the Y-valve and potentially even set up a gravity drain for the tank, resulting in a very simple system. I believe the later variants of my boat (the 411 and 393) actually had the aft holding tank in this location. The downside of this is we’re a family of 4 and 20 gallons still isn’t huge. I’m thinking the 35 would still last longer between pumpouts, even if we need to send more water through the 15 foot line to keep it clear.
What’s the better option here?
Alternatively, there’s an alcove next to the toilet that could fit a tank of about 20-25 gallons. This would cut the hose runs to effectively nothing, and I could eliminate the Y-valve and potentially even set up a gravity drain for the tank, resulting in a very simple system. I believe the later variants of my boat (the 411 and 393) actually had the aft holding tank in this location. The downside of this is we’re a family of 4 and 20 gallons still isn’t huge. I’m thinking the 35 would still last longer between pumpouts, even if we need to send more water through the 15 foot line to keep it clear.
What’s the better option here?
