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0. INTRODUCTION
Dear customer,
The product you have chosen is a biomass boiler
with condensation technology, that is, one of
the most efficient boilers - with least emissions -
in the market.
This boiler can work at seasonal performances
surpassing 103% efficiency, while high class
biomass boilers work up to 95%, and mid class
appliances barely reach 91% efficiency.
Condensation technology
During the combustion process, steam is
released from the moisture contained in pellet.
Condensing boilers exploit the latent heat of
vaporization (change of state heat) condensing
the steam from the flue gas and transferring this
heat to the water circuit of the boiler. That is,
they take advantage of a heat that would
otherwise be lost along with the flue gases
through the chimney.
As a result, flue gas temperature is below 50°C
under condensation conditions, and below 70°C
under non-condensing. In the case of
conventional boilers, flue gas temperature is
usually between 120°C and 200°C.
Condensation happens when flue gas reach a
temperature below the so-called “dew point”.
The pellet dew point is around 45°C, and the
boiler’s efficiency is above 100% then this event
takes place.
The return temperature of a heating circuit
depends on the chosen system:
This return temperature must be between 30ºC
and 40ºC for the flue gas to reach the dew point.
To do this, condensing boilers have a stainless
steel heat exchanger, with a larger heat
exchange surface, for enabling it to transfer as
much heat as possible from the boiler's
combustion chamber into usable heat. For this
reason, even when working in a non-condensing
temperature range, the boiler performance will
always be higher than a conventional, that is, a
non-condensing boiler, because of its larger
heat-transfer surface.
This boiler complies with current regulations
and has been tested in external laboratories
accredited for certifying this type of product.
Installation of the boiler, checking and
maintenance should be carried out by
authorised personnel.