Stoves with open combustion chambers and open chimneys which are located in the
residential place or kitchens, for supplying hot water and heating, because of burning
inside a close area and also chimneys subscription between floors, put residence health in
serious dangers. Taking unites with open combustion chamber inside a living area let
some gases such as Carbon Mono Oxide & No.X influence and spread and consume the
area's oxygen. Breathing these gases, especially CO will lead to brain and heart tissues
being damaged because of their hard absorbencies by blood hemoglobin instead of
oxygen. In this case, in older people especially who suffer from heart and/or chronicle
diseases and in sequence decrease in blood transformation to heart muscles, received
blood since has not enough oxygen, may cause Necrosis or heart / brain failure.

Neither no wise man nor good engineers neglect the risk of diseases & deaths made by
spread of gas from some open combustion chambers and open chimneys installed inside a
closed residential area and fire risk and the speed of fire transfer between apartments.
Besides, installation of such these systems with open combustion chamber in a closed
area of a building, an unexpected defect, gas leakage into atmosphere and accumulation,
can make a real catastrophe with uncompensating results just with a smallspark for all
residences and neighbors. In the other hand, cause of shape and form of these unites
atmospheric burner, mostly, and inability for controlling oxygen . Nitrogen in high
temperature of flame make different composition with oxygen called NoX which are too
dangerous and toxic and in lungs mix with water and make toxic acid, these acids can be
absorbed by blood and hurt the kidney, heart and brain cells. Acid rains that ruin woods
and plants are a mixture of NoX gases with water in the high chimney.

Another kind of heating unites is steel boilers, installing in central heating systems , not
having all the above harmfulness. But since they are made by shaping and welding the
metal sheets and pipes provide less flexibility of forming and bring the best heating
surface and the highest heating efficiency. Too high fuel usage, defect & corrosion are
some other week points of this system. Moreover, in welding points, two different
materials make a thermocouple and corrosion creeping circulation. Where sulfur
composed in fuels, in burning, making sulfur acids, that increase rate of defecting,
rustling steel sheets from outside and creeping corrosion by water from inside. Cast Iron
Boiler overcomes these problems, too.

These boilers in comparison with cast irons that both external & internal surface is jaggy
and porous. 50% of heating surface is in touch with flame as exterior and another half is
in touch with water as interior, functionally, make two proper and equal surfaces for
100% heating surface. This will increase heating output and bring down fuel usage.

Central heating systems with cast iron boilers is free of all above disadvantages. Because
of combustion system with burners equipped with fans and also complete close
combustion chamber with enough space, waves and fins made in internal side of boiler,
combustion will be complete and external gases, at the final phase, while passing through
channels in contact with heating balance parts which are completely roasted, will be
completed and goes by to the specific chimney to the roof.

Irrigation parts are some ten times more extended than boilers with copper piping, so that
their blocking and corrosion of boiler by water hardness is less than usual. Closed boiler
and outer way just by a chimney and open fan for central unite, applying a fan for burner
and gas evacuation before li ft ing as if gas leakage, has no risk for gas accumulation rather
other systems.

So that locating outside living area, access to the central system is in control of an expert
and there will be no pressure on system with open exhilaration system. There is no trace
of combustion because of complete closed boiler, too. This system is very much
common in Europe and US and major installation masterpieces studied it moreover.