copper water heaters??

[big worm]

i have seen several decent sized copper boilers in pictures here on site?? would they be water heaters? in the states they are steel and need replaced like in 5-6 years due to leaks, even less if you get a crappy one. i was wondering if copper is used in other countrys.

[HookLine]

Mostly stainless or enamel covered mild steel here. A few are silicon bronze, which would probably make pretty good boiler, though I don't know of anbody who has one as a boiler.