Water Tank Installation Issue Advice Needed

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powbongo

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Can anyone give advise, I currently have a 100 litre rigid water tank fitted in a pressureised water system supplying calorifier and two outlets, heads and galley. I would like to supplement this with the installation of a 120 litre flexible water tank, can anyone give installation advise on how best to join the two tanks for ease of use. I am hoping to utilise the existing deck water filler with a 3 way valve to fill the rigid tank and the flexi tank.
 
One good way is to cross couple the two tanks via a valve. Either have a cross coupling tank low down (which is what we have) or ensure that the draw is from the tank that is filled first.

Open the cross couple valve - fill both tanks. Close the valve. When you get low, open the cross couple valve and you allow the water to flow across. If you want to be clever, allow the levels to equalise and then close the valve again.

This way you always have some reserve fresh water...

It does require both the tanks to be at the same height in the boat and I am not sure it will work so well with one tank being a flexible, but I can't see any reason why it shouldn't.
 
powbongo said:
Can anyone give advise, I currently have a 100 litre rigid water tank fitted in a pressureised water system supplying calorifier and two outlets, heads and galley. I would like to supplement this with the installation of a 120 litre flexible water tank, can anyone give installation advise on how best to join the two tanks for ease of use. I am hoping to utilise the existing deck water filler with a 3 way valve to fill the rigid tank and the flexi tank.
Click to expand...

Personally I wouldn't bother with a 3 way valve on the filler. Just a 'T' so boat tanks get filled. I would then have the outlet of the two tanks coming to a 'T' valve so you can draw from one or the other.
 
That is the way mine is set up with a rigid tank first, then a 1 1/2" valve to a flexible additional tank which just acts as extra capacity. Fill both through the rigid tank and shut off the valve when the flexible is full. Have take offs from both with a changeover valve.

BTW if you are thinking of a triangular bow tank, I have a new (still in box) 120l Plastimo one surplus to requirements. PM if interested.
 
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