On Oct 19, 4:20 am, wrote:

Grr. With the cold water tank now moved, the hot
water cylinder has a head of 8 meters. Is there a
safety margin on cylinders that this is within, or
do I have to rip out the airing cupboard and replace
the cylinder? There's no room to move the cylinder
upstairs with the cold water tank.

Thanks.

Hi,

A grade 4 cylinder will take a suprising amount of pressu

http://www.maib.gov.uk/cms_resources/fleur-de-lys.pdf

See para 2.2.2

I'd be inclined to rig up a hose to give a 10m head on the cylinder
and leave it a couple of days to check it doesn't leak (10m head =
1bar).

cheers,
Pete.