On 19/08/2015 23:40, Fredxxx wrote:
On 18/08/2015 21:05, Vir Campestris wrote:

snip

OK, thanks everyone. I've raised my concern over the downstairs bathroom
radiator - it has a large blister which might be full of water. But WTH
that's on a solid quarry tiled floor.

My experience is that water in one room will often spread into another,
and at the most inconvenient time possible.

Personally I would examine the blister a bit more and replace if
necessary at the same time as your other work.

The right time to do it is when he has the system drained. If it's full
of water it'll drop a teacup full on the floor, and that will be it.

Andy