Increasing cold water storage in loft

[oldfart]

Hi all
Intending to fit a pump assisted Mixer shower valve, upon reading the MIs
I see that my cold water tank in the loft needs to be at least 50 gallons capacity, Upon inspection I only have a 25 Gallon
I have limited space thanks to modern day trusses! And cannot get a 50 gall in there, I understand however that i could introduce a second 25 gall (slave ) tank.
Is there anyone who could assist me in understanding the layout of this task, what connections are needed between the two tanks, heights of connections etc, .
I,ve picked up snippets of info in the search engine but cant find a post with a full description of what to do and what go,s where!

Thanks in advance

 

[ChrisR]

Plumbing-wise you simply connect them such that the water goes into one tank and out of the other, with a link pipe near the bottom between them. Put the overflow on the "first" one!

 

[Breesey]

Connect with 28mm.

Cold feed to hot cylinder should be 25mm above cold distribution pipe and link pipe.

 

[Kes]

And if they're not the same height the top edge of the two tanks should be level.

 

[oldfart]

Thanks for the reply guys,
Am i right in thinking the new tank will take the mains feed & ballcock and the second (existing) will have the draw offs (allready in place).

I then join the two at low level with 28mm pipework.

How do i control the level of water in the second tank, do i fit a second link pipe sending water back into the new tank & ballcock?

Thanks again

 

[Bahco]

How do i control the level of water in the second tank, do i fit a second link pipe sending water back into the new tank & ballcock?

You don't as it will be the same level as the first tank!

Dont forget the overflow though.

 

[Breesey]

Dont forget the overflow though.

Get two byelaw 30 kits

 

[oldfart]

cheers bacho
its been bugging me for days, could,nt get this image out of my head of the second tank filling up and overflowing because of no ballcock, of course... water level will rise in line with first tank, cant believe what a **** i am

Thanks

 

[Breesey]

... cant believe what a **** i am

Thanks

Don't worry about that, just get two byelaw 30 kits.

 

[Bahco]

Someone will get my name right one day!

 

[Breesey]

It rhymes with macho though.

 

[Bahco]

It rhymes with macho though.

You have heard about my reputation then.

 

[Breesey]

It rhymes with macho though.

You have heard about my reputation then.

You wish!!