Fill your water tanks easily

Jun 1, 2009
1,837
Hunter 49 toronto
On my 49, there are 3 water tank fill inlets. I decided it was too much work for me to open 3 caps, fill, and then close them
On the stern of my boat, as is with most larger Hunters, there is a FW inlet. It connects to the system through the transom shower cold water line. In other words, instead of the boat’s pressure water system feeding the stern shower, you back-feed the water manifold which then provides water to the boat.
Hunter installed a pressure regulator to reduce dock pressure to a much lower water pressure that the whale hoses & fittings can handle
On my boat, there is a large water hot/cold distribution manifold next to the galley sinks under the trash bin.
Your boat will have one, but possibly in a different place.
On the manifold, each output has a built in valve, so that you can shut off individual branches
On my manifold, there were 2 cold valves that that nothing connected to them.
The “trick of the century” is as follows:
On the input side of your FW pump, install a 15mm T fitting in the tubing
Then, run the centre of the T to one of the unused manifold ports.
Turn off your FW pump.
Then, by opening up the unused valve, you are now sending shore water directly to all 3 water tanks .

Cautiions…..

You must watch your water tank gauges while you do this. If you overfill, it will stress the tanks. The excess water will go out the vent, but it’s not a great idea

Before opening the manifold valve, run your galley tap for a few minutes. That will get clean shore water into your boat, and purge the land pipes of stale water.

I haven’t used my deck fills in years, as this is way too easy
 
Sep 25, 2008
7,435
Alden 50 Sarasota, Florida
I believe it is a huge mistake to pressurize the tanks. maybe I don’t understand what you are doing but it sounds like you are.

The correct way to use dock (pressure) water is to isolate the tanks. That isn’t ‘full proof’ but greatly diminishes the chance of tank failure.
 
Jun 1, 2009
1,837
Hunter 49 toronto
I believe it is a huge mistake to pressurize the tanks. maybe I don’t understand what you are doing but it sounds like you are.

The correct way to use dock (pressure) water is to isolate the tanks. That isn’t ‘full proof’ but greatly diminishes the chance of tank failure.
This is no different than the water maker setup. The tanks are all vented, so filling them in any way isn’t problematic
 
Sep 25, 2008
7,435
Alden 50 Sarasota, Florida
This is no different than the water maker setup. The tanks are all vented, so filling them in any way isn’t problematic
Lacking clarity. Our watermaker doesn’t feed pressure water to the tanks. Nor should it.
 
Dec 2, 1997
8,944
- - LIttle Rock
You need to know that no matter how cheap or expensive, the are only 2 types of shore water pressure relief valves: those that have failed and those that will. So NEVER leave the boat or turn in for the night with shore water connected to the boat...Only when you're aboard and awake to hear the first sound of gushing water.
Several years ago an SBO member reporter that he'd been awakened by a full bladder and stepped out of his v-berth into calf deep water.

--Peggie
 
Jun 1, 2009
1,837
Hunter 49 toronto
You need to know that no matter how cheap or expensive, the are only 2 types of shore water pressure relief valves: those that have failed and those that will. So NEVER leave the boat or turn in for the night with shore water connected to the boat...Only when you're aboard and awake to hear the first sound of gushing water.
Several years ago an SBO member reporter that he'd been awakened by a full bladder and stepped out of his v-berth into calf deep water.

--Peggie
Peggy
Couldn’t agree with you more.
I never leave the dock water connected when not on board. I actually pull the hoses from the faucet, as I’m concerned that someone might accidentally turn it on
I know of another 49 that had a huge flood because of this.
Your words of wisdom are well founded
 
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MFD

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Jun 23, 2016
203
Hunter 41DS Pacific NW USA
I have also thought about repurposing my shower water inlet.
Similar, but slightly different use case.
I work from home, and am often anchored for several weeks at a stretch. I have some 5-gallon jerry cans that sometimes I fill up with water when doing a dinghy run, and a portable electric pump that runs off a 20V DeWalt tool battery.

Currently, dinghy tied sideways off the stern, I have PVC pipe with stick and a short from the jerry can to the water pump on the swim step. Then the regular big bulky hose from the portable pump to the tank deck fills. Standing on the swim step pumping water, that shore inlet is right there on the port/stern. Just using that would get rid of the entire bit about having to run that bulky hose on the deck, and then storing it away, etc.

So like you, I would be changing the inlet connection to fill the tanks from time to time, not for 24x7 use.
Interesting idea on just changing it right at the manifold, and glad to hear it works.
I'll have to look at my setup again, for some reason I think that shore water inlet might share the cold water line with the cockpit shower system, not sure.