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Waste water on 470e

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Doug470e View Drop Down
Sub Lieutenant
Sub Lieutenant

Joined: 10 April 2022
Location: Oban - Scotland
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    Posted: 10 April 2022 at 18:31
Hi all.

Excuse my ignorance here but hopefully no such thing as a stupid question.

There is a filler cap on the starboard side labelled FRESH WATER which fills 1 tank, but there are 2 tanks on the yacht... i think. On the control panel at the chart table it shows tank 1 and tank 2. So i am assuming you fill each tank separately or are they linked?

On the port side there are 2 WASTE WATER caps, is one of these the other fresh water tank, if not does this mean i have 2 waste water tanks? And if so how is it emptied if filled…

I've not had the yacht for long and never had a yacht with a waste water tank . Also I also cant seem to find a waste tank even if there was one....

I told you it was a stupid question!
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Wayne's World View Drop Down
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Vice Admiral

Joined: 18 July 2012
Location: Cruising
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 15:30

I thought you would have an answer from a 470 owner by this time. 

We do not have a 470 but some quick research found that most 470 have two heads and two small sullage tanks of about 30ltrs each. In the heads there will be a valve to open to release the sullage from the tank. The tanks will be fitted above the water line to enable them to empty by gravity. The fact you have two "sullage" deck fittings points to your boat having two sullage tanks. The tanks would be fitted in the heads area behind the fitout. The valve is likely to be adjacent to the toilet behind the fitout accessed by some sort of small door or hatch. 

Regarding the water tank question the only thing I could find was the tankage total was between 380 and 400 litres. If you only have one filler but two tanks they must be linked. I would expect there is either an isolation vale or selector valve in the fresh water system somewhere you just need  to look.  

Enjoy your new boat.
Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2023
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32mike View Drop Down

Joined: 26 March 2020
Location: FLorida, US
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 32mike Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 20:11
I’ll throw in a couple more items to check out. I’m guessing you have two heads.  In our 2 year old boat, the waste tanks are one in each head, behind a flat wooden panel next to the sink at about chest level. The panel pulls off with a rubber suction cup puller that came with the boat. The panel is held on by two plastic tab clips, one on each side. It just pushes back on. The dump valve, or Y valve is under the floor board just outside the head, accessed by a small, lift off panel. It’s a large valve with large hoses going to it. When it is closed - horizontal, the tank fills up. When it is open, vertical, the toilet empties to the sea. There are very specific country based rules with further restricted areas about where it is permissable to dump to the sea. The two caps labeled “waste” are for suction emptying each tank at a dockside pump out facility

Not sure about the water tankage. Our boat has one tank under the bed in the forward cabin filled at one cap on the starboard bow labeled “water.” The tank is accessed by a lift-off panel under the mattress. There should be a small key with two prongs that fits all of the caps.

Hope that helps some.
S/V Dulces Sueños
458 #087
Tampa, FL
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psousa View Drop Down

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Post Options Post Options   Thanks (0) Thanks(0)   Quote psousa Quote  Post ReplyReply Direct Link To This Post Posted: 12 April 2022 at 06:49
Doug470e, you’re right, you have 2 water tanks, almost 200 liters each, but they are connected and they both fill using the same deck filler cap, the starboard one.
It’s also true you have 2 small black water tanks, one per each toilet. That’s why you have 2 waste caps on the deck, port side. In my boat you can’t easily take the locker panels to see these black water tanks as these panels are bolted, but both has a vertical ‘window’ to control the tank level (a shame that Hanse didn’t install a level gauge from factory here, actually is my first sailing boat without a gauge on the black water tank). As someone said, if you never filled them up it’s because the ball valves are open and everything you do on the toilettes is going directly to the sea water (the aft cabin valve is under the floor board just at the entrance of the toilet, the front head one is under the sink, accessible by the locker).

Still regarding the water tanks, both fill up at the same time but you can control which one you use. There are 2 red ball valves under the floor board on the right of the saloon table, each one closes one water tank.

This may be slightly different from boat to boat, even on the same model. Mine is 2010 470e.

Edited by psousa - 12 April 2022 at 06:50
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JonB View Drop Down

Joined: 21 September 2010
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2022 at 21:28

There are four water tanks on a 470, although two are inside one on each side, baffles!

It is possible to fill all tanks from one filler but you'll have to wait for gravity to balance the levels out, so best remove both tops to allow air in and fill to the overflow kicks in on one then fill the the other.

As most of the weight has been badly located to a port bias, batteries and navigations hard ware. I tend to close the starboard tanks so that water used is from the port side only, evening out the weight distribution and then judge when to adjust. I have a manifold with four valves.

The day heads and that of the master cabin are also on the port side and if you have the seacocks closed these will fill up.  A suction pump can be inserted into the pipe and remove the waste black water.

You can tell with some experience as to how full they are by simply tapping on the sides nd listening to the note coming back.
Jon B
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