We nearly died because of a failed chiney cap,

What happens is the cement top cracks water gets between the ceramic
liner and bricks and freezes The liner broke and fell in and plugged
the hot water tank flue, we got carbon monoixide poisioning,
fortunately a friend visited he is a volunteer fireman and realized
what was happening. ventilated house, furnace flue fine hot water tank
plugged.

had chiney sweep come immediately roof covered with ice, ladder wouldnt
reach.

it was one of those close calls where you realized it might have been
your day...

get this fixed immediately!

probably a good idea for a camera inspoection of the inside to make
certain everything else is ok espically if ypu have a fireplace