DIYbanter - HOT WATER ON DEMAND, HEATERS

On Nov 25, 5:01*pm, harry wrote:
On Nov 25, 8:52*am, The Daring Dufas
wrote:

On 11/25/2010 2:33 AM, harry wrote:

On Nov 24, 8:45 pm, *wrote:
On Nov 24, 12:53 pm, *wrote:

* Your *own, UK, certified testing standard, you are a nuts to keep
this crap up because none are certified over 100%, none are even 91%.
Your rating is more conservative than our US rating, read it and
please stop the missinformation.- Hide quoted text -

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Here's one.....
http://www.warmflow.co.uk/pdf/Gas_Boiler_Brochure.pdf

Hang it up Harry your to old for this. SEDBUK shows no Warmflow over
90.4% Thats your UKs agencys ratings. *But just to show you you can`t
even read a simple spec sheet . The Warmflow GS 25a is a Sedbuk A
class. *It has an input rating of *KW *25 * *output KW *24.6. *Now you
simply take out your pencil, sharpen it, get some clean paper *and
subtract the two numbers and you will see your spec sheet shows it to
be *97.6% efficient. Just what I said that 98% is the high and nothing
is at or over 100%. Its real simple to grasp Harry, output is less
than input. Hey Harry, I own the Brooklyn Bridge, I will sell it to
you real cheap

Try

The SEDBUK things is for comparative tests on available boilers. *They
probably haven't got round to testing this one (or updating their
website)

I can see you still haven't grasped the different between net and
gross calorific values.

What you say is true, but more heat is recovered by the condensing *of
combustion gases. The figure given covers the chemical energy
recovered from burning the gas. The additional heat recovered comes
from the physical conversion of the water vapour to liquid.

Because they were comparing condensing and non-condensing boilers at
one stage they get these figures of over 100%, obviously only for
condensing boilers. *Equally obviously not every condensing boiler has
efficiency of over 100%, it depends on how big and how well designed
is the heat exchanger. Also very important the flows of water inside
the heatX and gases outside.
If you look at the layout in the pictures, you will see the design is
pretty untraditional.
Excess air requirements are reduced. *The exhaust gases also pre-heat
the incoming air in most cases.

Harry, for these 100%+ boilers to work is a draft inducer necessary? I
ask that because in the region of the U.S. where I live, you don't see
many homes with boilers. The most common form of heat is a central HVAC
forced air system. All of the high efficiency furnaces I service have a
draft inducer blower and the higher efficiency condensing furnaces have
one ore more drain lines internally to drain the condensate from the
combustion chamber and draft inducer housing.

TDD- Hide quoted text -

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There is no chimney in the normal sense. *They are "room sealed". *All
you see outside the building is the horizontal air intake (about 4"
dia,) and the comustion gas exit is a pipe concentric down the middle
of it. *It projects maybe four or five inches. It is driven by an
electric fan that blows the air/gas mixiture into the boiler.
*In days of yore this was all bigger and *worked by natural draught/
convection. *Bacause the intake and the exhaust were concentric, they
were unaffected by backdraughts caused by wind effects. *However when
they went condensing there was no natural buoyancy left in the
combustion gases to drive this system so the fan had to added.There
are some pix here. The square one is the old fashioned one

https://environment7.uwe.ac.uk/resources/constructionsample/conweb/heating/fluesfour.jpg

Yes they are all fitted with drains. *The condensate is acid.
(Dissolved CO2)- Hide quoted text -

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