On Sun, 3 Feb 2008 08:38:47 -0500, "Edwin Pawlowski"
wrote:

"RBM" wrote in message
...
I would suggest first contacting the service guy who knows the system. It
sounds like the leak is coming from the pressure relief valve and not the
boiler itself. This is a brass valve with a lever on it and usually a pipe
aiming down to the floor. This valve will blow off on high temperature or
pressure. The valve could be bad, the water pressure feeding the boiler
could be to high, or the boiler could be overheating, causing it to blow.

Very likely the case. Replacement is simple if you have a little
experience with using wrenches. One of the most common is a Watts brand
that sells for about $65.

My boiler was doing the same thing last winter. You could watch the
needle on the pressure gage slowly creep into the red zone as it came
up to temperature, then see water start to trickle out the overflow
pipe. It turned out that the pressure relief tank had become, in the
words of the service tech, "water logged". He simply drained some of
the excess water inside this tank (thereby restoring the air space
required for it to do its job) and the problem went away.

Cheers,
Paul