Plumbing for Dishwasher and Washing Machine

[sailorchic34]

Another option would be to put a Tee in a sink drain tail piece and pipe the discharge to there.

[Mark Thurlow]

Pelagic and Lepke,

You both have this . I am going to go for the simple, and scrap the sump and go for the above hull existing ports .

Thanks for all the advice.

[Terra Nova]

The force of a washing machine's pump discharge would likely spray all over the headliner (from a T-ed sink drain) before an underwater outlet could handle the flow. Remember how large the standpipe in a house is.

[Dockhead]

Originally Posted by Mark Thurlow

Pelagic and Lepke,

You both have this . I am going to go for the simple, and scrap the sump and go for the above hull existing ports .

Thanks for all the advice.

Be very, very careful about the risk of flooding.

I would suggest a properly designed and specified vented loop, plus shutoff valve always used in rough weather.

[sailorchic34]

Originally Posted by Terra Nova

The force of a washing machine's pump discharge would likely spray all over the headliner (from a T-ed sink drain) before an underwater outlet could handle the flow. Remember how large the standpipe in a house is.

Actually in many parts of the country the dishwasher is plumbed to a tee in the kitchen sink drain or at the disposer on a land side home. Other parts use a standpipe, depending on plumbing code.

Of course I have 1-1/2" drains on my sinks. some boats only have 3/4" and that could be an issue.

[Terra Nova]

Not dishwasher--much different--I was referring to a washing machine.

[jeremiason]

Originally Posted by Dockhead

Just be sure that you have covered any flooding risk.

It has a syphon loop... So far so good after 9 years and 12,000 NM


Washing Machines on Catalina 470s are mounted in the forward head.. If a hose went and there was a flood, the water would drain to the bilge until I could shut it off.


Would never run the machine when away from the boat...

[Dockhead]

Originally Posted by jeremiason

It has a syphon loop... So far so good after 9 years and 12,000 NM


Washing Machines on Catalina 470s are mounted in the forward head.. If a hose went and there was a flood, the water would drain to the bilge until I could shut it off.


Would never run the machine when away from the boat...

I don't mean flooding from the washing machine effluent. That comes from your tanks so can't sink your boat (even if it makes an awful mess).

I mean the risk of siphoning seawater into the boat when you're heeled and sinking you.

The OP was thinking about putting in an above the waterline through hull for this. I just wanted to remind him not to forget the antisiphon loop.