Purchasing a right
boiler has always been a challenge. With different types of boilers i.e.
conventional, combination and system boiler there comes a choice of condensing
and non-condensing boilers which should also be considered while buying a
Don’t worry if you are
unaware of the difference between condensing and non-condensing boiler. We are
here to assist you and tell you the difference between these boilers. Keep
reading to know more and more information about these boilers.
When a boiler burns the fuel, combustion process releases
water vapour. This water vapour steams contains heat in it and the money you
are paying for the heat has been literally gone out of the window. The main
difference between the condensing and non-condensing boiler is that condensing
boiler don’t let that water vapour steam go to waste which gets disused by the
non-condensing boilers. Instead the condensing boilers draw so much of heat out
from the vapour that it gets condenses again into water. This condensed heat is
then used for heating the rooms and water tanks.
As a result condensing boilers need less fuel to produce the
same amount of heat and less carbon emissions than non-condensing boilers. Thus
they are environment and pocket friendly boilers.
Which boiler is more
efficient between the two?
Condensing boilers are more efficient than non-condensing
boilers as they captivate and reuse the heat unlike the non-condensing boilers.
We can get 90% efficiency rate from the condensing boilers and only 70% from
non-condensing boilers. Whereas in earlier days the efficiency rates falls down
to 50-60% which means a huge waste of money and heat.
The quality of using heat in flue gas to pre-heat the cold
water and boosting the efficiency makes the condensing boiler an ideal boiler
for the users.
Which boiler does the
Both Non-condensing boilers and condensing boilers can do
the condensation. But condensation done by the non-condensation boilers reduces
its lifespan. On the other hand, condensation boilers are designed and
manufactured to tackle the condensation process of the boilers. Condensation is
occurred when the water vapours cools down and turn into moisture during the
Which boiler operates the temperature better?
The operating temperature of a condensing boiler is lower
than that of non-condensing boiler; it affects the heat emitters and
distribution system of the boilers. Whereas at the time of condensation,
consider outdoor air reset during the boiler selection. The cooler we store the
boiler, the more it will condense. Thus, it is always advisable to change the
radiators and piping whenever you shift to condensing boiler from
non-condensing boiler. As the condensation will still happen even in the lowest
Which boiler has a
proper venting layout?
Venting for both the boilers is different from each other.
Due to high operating temperature, a metal type B vent with vertical
termination is required in non-condensing boilers. This type B vent is negative
pressure, is not air tight and does not prevent it from corrosion. Whereas, in
condensing boilers PVC pipes are used that can be terminated to side wall.
These PVC vent is positive pressure, is air tight and provides corrosion
resistance as well. Therefore, unlike
the non-condensing system where the air combustion for condensing burners is
taken from the room, condensing boiler takes it directly from the outdoor
Which boiler is safer
for my place?
Condensing boilers are perfectly sealed for heat
insulations. Unlike the non-condensing boiler, it captures the air directly
from the outdoor environment. So there is no risk of anything clogged in the
boiler. Also the risk of inhaling any toxic air has been prevented with the
condensing boiler. As it directly disposed of via pipe connected with the
Which boiler has the
best quality material?
Non-condensing boilers use type B vents material which can
easily get corroded and on the other hand the condensing boilers have stainless
steel or PVC vent which is the best choice for condensing boiler or water
heaters heat exchanger.
Which boiler is best
The UK govt. says that when you get a new boiler it should
be a condensing boiler unless there is a strong reason why not. Though,
non-condensing boilers can also be installed where the heating engineers has
determined that condensing boiler is unsuitable for the property. Whereas
installing a non-condensing boiler requires a legal certificate that is
provided by the engineers to the users. It is important for the homeowner to
keep the certificate safe as whenever they wish to sell the property this
certificate will confirm that existing installation of non-condensing boiler is
Difference between condensing and
One or more heat exchanger
Single heat exchanger
Water vapours is recycled through the condensing
Combustion gas go into flue and heat is wasted.
Higher initial cost, but lower maintenance needed
Lower initial cost but high maintenance is needed
Less carbon footprint
High carbon footprint
temperature of combustion products
Higher temperature of combustion products
Some best condensing boilers
Viessmann Vitodens 200-W
ATAG iC Economiser Plus 35
Vaillant ecoTEC exclusive with Green iQ combi
Worcester Bosch Greenstar CDi Classic
LUNA DUO-TEC 40 GA
condensing boiler operates more efficiently in homes with low system
temperature and is easy to install and use. Condensing boiler has always been
the ideal choice for the users as it allows them to reuse the heat and
minimizes the energy bills as well.