On Jun 5, 7:53*pm, Roger wrote:
The message

from contains these words:

Meanwhile something for the Dribbles of this world to get their
teeth into:

"Condensing boiler technology is evolving rapidly. A fully condensing
boiler with a cast-iron heat exchanger has been introduced in the United
States. It deals with the corrosive nature of the condensate produced in
it by increasing the wall thickness of the heat exchanger sufficient to
deliver an expected residential life of four to six decades and by
discouraging the conditions that accelerate corrosion."

If Dribble and his pal are to be believed that would be a condensing
boiler with an efficiency in the region of 65% at best. *:-)
No-one has made such a claim. We were discussing old iron exchanger
boilers decades old. You and facts eh.

Even more like Dribble than before. Moving the goalposts and falsifying
what has gone befo-

"IOW its datedness is not a cause for any concern... but if cast iron
then replace."

Looks like you misunderstood. Perhaps it would have been marginally
clearer to have said 'An old boiler is not a cause for any concern,
but if its also cast iron then replace.' I did not anticipate your
misunderstanding.