2 water tanks sharing 1 overflow pipe ?

katy39

HI all,
I have a water tank and a small tank ( I think for central heating )in my attic, both have overflow pipes to the outside but they are a obstruction to me getting into attic, I want to know if its ok to plumb both tanks up to a single outlet and i can get rid of the other one ?
Thanks

sky6

Yes there's no reason why you cannot use the same overflow pipe as it's very unlikely that both Tanks would develop a problem at the same time.

K.Flyer

If you must do it, then it is important to plumb them in such a way that in the event of a ball-cock failure that the central heating tank water cannot back flow into the cold water tank.
If you are plumbing the two into one, i would also recommend that you increase the pipe size at the point where they connect.
E.G. Two 22mm overflow warning pipes joined to a 28mm pipe.

katy39

Would that be a problem giving that both are supplied from the same coldwater mains ?

Wearb

katy39 wrote: »

Would that be a problem giving that both are supplied from the same coldwater mains ?

Yes it would. The heating water would have inhibitor added and would have become contaminated in the heating system. You have to make sure the water in the small tank doesn't mix with the large one.
If possible, use two seperate overflows, otherwise follow KFlyers advice.