You probably cannot count on boilers to be in the
list of quietest heating appliances so far, but some sounds from your system
can ensure you on the existence of a problem in your unit and that is when you
need to learn on why your boiler is making noise when heating is on. One of
those noises can be a loud humming noise which is not a normal boiler sound produced
during the operation of a healthy boiler.
This humming sound cannot be pleasing and would
require you to figure out the issue and solve it as soon as possible. So in
order to answer your question as to why is my boiler making a humming noise, we
have mentioned a few points below.
From our understanding of boilers there can be 3
main problems that happen to be the reasons of your system making a humming
1) Loose components:
One of the most common reasons of
your boiler making a humming noise while operating could be any of the components
of your system might have made its way to loose. A component when silently
vibrates against the other parts, produces a loud humming sound that needs to
be fixed. Though the fix is simple, yet delaying the repair could cause your
boiler to get even more damaged. Once you are sure about the issue, stat
looking for :
brackets- You can try fixing the loosen bracket area with a screw or
of the unit itself- It is highly recommended to go for a professional help in
case you find your system to be vibrating in order to stop the unit from making
panel/compartments- An open panel or compartment in the system can also be a
cause of the sound being produced. While for this, you need to make sure that
all the compartments, panels, and openings are well closed.
2) High pressure:
your boiler is making a really loud humming noise then you need to look out for
the water pressure of your system. A system operating on a higher pressure can
be a cause, contributing to the loud sound that is being produced.
considerable point in this case is that a normal healthy boiler would never exceed
the pressure limit of 12-15 psi (pounds per square inch). So if your boiler is
operating at a pressure over 15 psi then this could be the reason for your
system to produce that sound.
this is not felt to be like an emergency case, as the modern systems are made
with the pressure relief valves to handle such problems for you. But if the
problem continues for a longer time then you could try turning the water and heating
off, which is believed to help you put the pressure back to the normal levels.
For other high pressure issues it is highly recommended to consider a
3) Circulating pump set too fast:
circulating pump operates to circulate the heated water from the boiler to
radiator and then back to the boiler. If the circulating pump somehow gets set
at a faster speed, then you would witness vibrations and a loud humming noise.
that is the case then you need to look for the circulating pump of your system,
and check the speed settings. Reduce the speed of the system and see if that
stops the humming noise.
the sound stops, then leave your system to operate at a lower speed but if this
doesn’t solves the problem or causes any hot water discomfort to your family
then you are highly recommended to consider a professional help in that case.
While on a clear note these are not the only issues
that cause a humming sound in your boiler but these are some of the most common
reasons that happen to disturb your peace of mind.