"New & Improved - N/F John" wrote in message
news:x8J1j.6675$ch.5289@trnddc03...
What can be done to flush it? Should I attach a garden hose to the drain
on
the covered piping and force water in the opposite direction? What about
some air pressure?


Depends on your boiler design. Some can be opened up and a hose can flush
it out.

In use, the boiler should be given a "blow down" on a regular basis. This
is done by opening up the drain while it is operating under pressure. It
forces out any accumulated solids. The water column should be flushed that
way also. Industrial boilers are piped into a tank that can take the
pressure and steam and then allows the water to go to a drain.