Went on one call today and had another query by Facebook about this
so I though why not write an article about it. Both persons were very
concerned as they saw water dripping from theirs boilers. A closer
inspection for both showed that it had nothing to do with the boiler its
self.
There are many things that can make water leak from your boiler. If
you know for sure that the water is coming from a hole in the sections
then you may have a serious problem. Usually though there is an easy fix
for that also, more on that in another article. Both boilers today were
leaking water from the relief valve.
This valve is design to relieve the excess pressure from the boiler
in case of a build up of extra pressure in the boiler. The extra
pressure can come from a number of different things. A few of the causes
may be a bad expansion tank, a bad fill valve or pressure reducing
valve, or an open bypass valve. The bypass is easy, just close it and
relieve the extra pressure. The others are not as easy.
Your expansion tank is simply a tank that allows water from the
system to go in and out according to the pressure in the system. This
tank contains about ? air which acts as a cushion to absorb the extra
volume of water that is created as the water is heated. Hotter water
takes up more space or volume, so it needs a place to go to when it is
heated. If the expansion tank is totally full of water then, it will
push water out of the relief valve. Changing your tank will fix the
problem.
If the reducing valve or fill valve is leaking by then you can also
get extra pressure in the system. A normal heating system will only run
10-20 psi pressure. Most well systems or city water is way higher than
that. If the pressure in your boiler gets over 30 psi then it will begin
to relieve the extra pressure by dripping water.
If you have a drip from you boiler this is what you check. First the
expansion tank, the reducing valve, and the bypass valve that bypasses
the fill valve. This valve is usually installed to quick fill the
system, or purge the water lines of air.
Often there is just a small problem that looks like a big problem. Do
not get excited and methodically check through the possibilities. You
will usually find that the problem is not nearly as bad as you first
thought that it was.

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