In article 2,
DerbyBorn wrote:
After lots of checking a Heating Engineer has decided a mate's heating
system has a partly blocked boiler heat exchanger. Likely? 12 - 15 years
old. Has been pressure cleaned a couple of years ago.

I live in a hard water area and my boiler was installed in 1988!

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle