Connecting 2 cold water storage tanks

[secret squirrel]

Hello All,

Just need a little advice, I have got to put a cold water tank in a loft (currently it is in an airing cupboard). The loft hatch is quite small and I may need to join 2 25 gallon tanks together.

I just need to check that I am thinking along the correct lines. Cold water feed comes in at one end (obviously), tanks are joined by 28mm pipe at the bottom with a 22mm feed to the hot water cylinder at the opposite end to the feed (bottom of the 2nd tank) with an overflow exiting at the second tank. This should be 22mm.

Can I get away with one 25 gallon tank, this would be supplying hot/cold water to 1 bathroom and hot water to kitchen sink?

Thanks

 

[stephenf8542]

I'd go for to for when the baths running,the washing machine and dishwashers going at the same time

 

[Puddle]

Yes you would need at least two 25 gal tanks,you can also get coffin tanks that fit through small hatches,All pipework as you say however overflow pipework should be attached to the same tank as the cold water inlet

 

[secret squirrel]

Thank you, I never realised there were such tanks as coffin tanks

 

[stevetheplumber]

Thank you, I never realised there were such tanks as coffin tanks

you can get a round 50/70 through a 600mm square hatch if you know the trick of how to fold it
basicly you put a rope or ratchet strap round the tank and fold the sides in till its banana shaped and feed it through so the base goes through corner to corner of the hatch

 

[secret squirrel]

Thanks again, I'll give that a go.

 

[PLUMB111]

here is a link for you.

Cold Water Coffin Tank 25 Gallon 1390 x 500 x 310mm - NoLinkingToThis, Where the Trade Buys

Rgds
Peter

 

[Bernie2]

Don't forget a proper platform and BY-Law 30 kit, with ball valve plates fitted!

And yes 50 gal round tanks/cisterns do squash down, but watch for the cheap ones they can crack.

And yes again, its in one end out the other, the object being to avoid stagnation in any part of the tank/cistern. If you fit two cisterns I rather fancy the overflow is better in the tank with the ball valve as sometimes there is a slight difference in water level if the coupling pipe is smallish. Its the resistance. So putting the overflow in with the ball valve gives the first signs of a problem. That is of course until the cylinder heats up and the hot water backs up the cold feed in the other cistern/tank raising its level before the ball valve tank/cisterns level.

Isn't Plumbing fun????

Make the last metre to the ball valve in plastic pipe. Stops a lot of water hammer noise problems.

 

[secret squirrel]

Thank you all very much, I have gone back to re-measure the loft hatch and can get 1 50 gallon coffin tank in through the loft hatch.

At the moment the customer has all pipe work in 15mm, from the hot water cylinder to the bathroom, isolators (not full bore) are on every tap and the cold water cylinder is less than 1 metre above the hot water cylinder.

Not surprisingly there is practically no flow in the bathroom. Thanks Bernie, perhaps "plumbing is fun" is not totally accurate for me but I am intrigured to see how much difference this work will make.

I am also increasing the pipe work to 22mm where possible.