Question?
Does an eco hometec boiler
need to maintain hot flue gas temperatures?
Answer:
No, eco hometec
boilers and flue systems are designed and
constructed from stainless steel and PPS
plastic. The condensate water from
condensing flue gases does not affect these
materials.
Question?
What are the advantages of
such a design?
Answer:
Unlike
conventional
boilers eco hometec appliances do not need
to waste gas in maintaining high flue gas
temperatures.
Question?
What does that mean in real
terms?
Answer:
By design eco
hometec boilers use less gas. They are a lot
more efficient than other boilers and will
significantly reduce your annual heating
costs.
Question?
Why should I choose an
eco hometec boiler?
Answer:
Heating our homes
and water for showers and baths is very
costly and bills in the future will only get
bigger. By choosing eco hometec for your
next boiler you can rest assured you have
chosen the most economical and
environmentally friendly boiler available.
Question?
Finally, what about the
environment?
Answer: All eco hometec boilers use less
gas and the emissions from the EC25 range
are NOx 8.1 – 27.1 ppm and CO 2.9 –
66ppm.
As you can now see there really is no
reason at all for choosing a boiler
constructed to an old and inefficient design
that needs to maintain high flue gas
temperatures.
3.
Not all boilers are the same
When deciding on a condensing boiler, we
know that as a result of their superior heat
exchanger design, we are getting a more
efficient boiler. Typical efficiencies of 86%
are achievable when fitted to an existing
system with an 80/70
0
C design.
But, by lowering the water return
temperature, condensing boilers are
capable of achieving efficiencies up to 98%.
How then can we lower the return water
temperature of our heating, increase
efficiency and at the same time save gas?
The eco hometec answer Variable
Controlled output (VCO)
To achieve optimum efficiency from a
condensing boiler we need to control the
temperature of the water returning to the
boiler.
This can best be achieved by adjusting the
output of the boiler and/or the pump speed.
The outside air temperature generally
determines the load on a heating system.
In the U.K we size a boiler to provide
enough heat to keep a house or building
warm at -1
0
C.
As the outside air temperature rises then
less heat is required to heat the building.
If we were using gas fires to heat our home
then as the building warmed up we would
turn down the gas fire. This has the
desired effect of lowering their output and at
the same time reducing gas consumption.
If we are using a central heating boiler to
heat our home then in an ideal installation,
as outside air temperature rise, we would
turn the boiler down to lower its output at
the same time reducing gas consumption.
The only problem was, until now, the output
of a gas boiler was determined by the set up
of the gas valve and only the service
engineer could carry out adjustments.
Until eco hometec developed Variable
Controlled Output it was simply not possible
to constantly adjust a boilers output and
flow temperature to cope with changing
weather conditions.
3.1
How does VCO work?
Unlike most boilers with a constant input
and output eco hometec boilers incorporate
an integral compensating and modulating
Page 6
ECO HOMETEC
(
UK
)
LTD
.