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Condensing boilers take their names from the process they go into during operation.
What makes them different from regular boilers is that they also extract heat from the
exhaust gases which would normally be given to the atmosphere.
Through addition of a second heat exchanger in the boiler, returning cooler
water is used to condensate the water vapour in the waste gas stream.
The temperature of a waste gas is about 150 – 200 degree Celius which
means a great loss of energy to the atmosphere.
By cooling down this gas you can gain back the energy lost to the atmosphere.
The water vapour in the waste gas contains 8% of the total fuel energy and
re-gaining this amount is quite a reasonable action.
Thus, you can get more heat from unit amount of fuel.
This will eventually lead to reductions in your fuel bills and also your
carbon dioxide emission will be lower and so do your contribution to global warming.
In short, high efficiency condensing boilers are cost
effective and greener heating devices for your house.
What does “high efficiency” mean?
Thermal efficiency of a thermal device is the ratio of the amount of energy output to the amount of energy input.
In other words, efficiency of a thermal device, i.e. a boiler, a furnace, etc., means what percent of the energy
in the fuel is converted to heat. In a less technical definition:
Efficiency is the ratio of what you get to what you pay for.
A high efficiency boiler means that you can get most of the energy in the fuel.
In laboratory conditions high efficiency condensing boilers have efficiencies up to 98%.
And actually you can expect about 90% efficiency when compared to old-boilers having efficiencies about 70%,
and sometimes as low as 50-55%.
As a simple guide to efficiency, boilers are labelled with an efficiency band from “A” to “G”. While A level means more than 90% efficiency, G level means less than 70 % efficiency. High efficiency condensing boilers are in the A band.
