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Old 04-02-2019, 02:13   #1
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Location: Valletta, Malta
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Shut off water supply

Hi Lagoon people,
I have a question, I hope someone in here might be able to help with.
I'm having a heating element replaced in the water heater.
In order to do this, I have to shut off the water supply.
Is this done in front at the water tanks or where?
My Lagoon is a 400S2 from 2015.
Thanks in advance :-)
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Old 04-02-2019, 02:31   #2
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Re: Shut off water supply

Usually water heaters have a valve at the cold intake and hot output. You shut those and open the drain until enough water drains down to clear the heating element.
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Old 04-02-2019, 03:43   #3
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Re: Shut off water supply

Greetings and welcome aboard the CF, Beck.
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Old 04-02-2019, 03:59   #4
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Re: Shut off water supply

Turn off the water pump.

I used plugs to jam the hoses without draining the whole water tank.
I did not find any valves to disconnect the heater alone.

You can change the heater inside the bunk compartment leaving the
coolant hoses from the engine connected, but I would suggest to
go the extra mile, get it out completely and rinse it with fresh water.

Inside is a lot of rust and remains of the old anode, I would definitely
go the extra mile and clean it before re-assembling.

You can let the heater drain to the bilge, the bilge pump will take care of the water automatically. Also there is a over-pressure vent that drains into the bilge anyway.
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Old 04-02-2019, 10:46   #5
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Re: Shut off water supply

Quote:
Originally Posted by CatNewBee View Post
Turn off the water pump.

I used plugs to jam the hoses without draining the whole water tank.
I did not find any valves to disconnect the heater alone.

You can change the heater inside the bunk compartment leaving the
coolant hoses from the engine connected, but I would suggest to
go the extra mile, get it out completely and rinse it with fresh water.

Inside is a lot of rust and remains of the old anode, I would definitely
go the extra mile and clean it before re-assembling.

You can let the heater drain to the bilge, the bilge pump will take care of the water automatically. Also there is a over-pressure vent that drains into the bilge anyway.
Helpful hint - we use old clevis pins as plugs.
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Old 05-02-2019, 12:02   #6
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Re: Shut off water supply

I also have a 400s2. No valve except at the tanks. I got frustrated and put one in.
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