4. Technical information
4.1 Description of the boiler
The Hoval UltraGas
®
is a low emission, energy-saving
condensing gas boiler comprising the Ultraclean
burner system, a gas fired premix burner with com-
bustion air fan. The Hoval UltraGas
®
has a vertically
disposed combustion chamber of stainless steel as
a primary heating surface and a secondary heating
surface of aluFer
®
composite tubes (stainless steel
on the water side, aluminium on the waste gas side).
The secondary heating surface is designed so that
part of the water vapour contained in the flue gas is
condensed and the vaporisation heat it contains is
utilised for the heating circuit. The gas burner is in the
form of a break draught burner, which can easily be
swung up for maintenance purposes. The UltraGas
®
is designed to operate with natural and liquid gas. The
figure below shows the design principle.
Flow Heating
High temperature return
Low temperature return
Vertical flue gas connection
Condensate collection tray
Gas safety and control devices
Combustion air fan
Electrode for ignition
and flame monitoring
Double ignition electrode
aluFer
®
heat exchanger
Trittbrett zur Service-Er-
leichterung (ausklappbar)
TopTronic
®
T controller
Optional additional controller
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