On Nov 30, 5:45 pm, robert wrote:
wrote:
Tony says: "If they are breeze block and not the soft Durox blocks you
should be Ok"

Just to clearify. The blocks in question are areated...I can't think
of anything weaker than this stuff.
I've bought them from a local B&Q store....
Maybe I'll have to check my terminology better next time, but I think
my concerns were justified.

How heavy were the blocks - a 1 hand lift or 2 hand lift (breeze block) ?
Another approach is to fix a wooden plate ( ply) to the wall ( same size
as boiler) using several fixing and then fix boiler to plate.
This way you can make sure you get good a few good fixs for the plate (
the boiler fixing holes are bound to line up with mortar joints)
and fixing the boiler level will be easy.

1 hand lift for sure...and I'm not Hercules.
As I said I can't think any block or brick weaker than this
stuff....they were more expensive than high density blocks, apparently
the aerated ones are great for thermal insulation but not very
"trusty" are they? Or maybe it's just a psychologic issue.
Meanwhile I'll consider the wooden plate or other similar
solutions...just for a bit of piece of mind.