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Preconditions For Installation; Regulations; Location; Fixing The Appliance - Bosch W11B Installation And Operating Instructions Manual

Gas instantaneous water heater
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Preconditions for installation

The appliance can only be sold in the countries mentioned
in the type plate.
2. 1


Any local by-laws and regulations pertaining to installation
and use of gas-heated appliances must be observed. Please
refer to the laws that should be attended in South Africa.


The appliance should be sited in a well ventilated room where
it will not be exposed to temperatures below freezing.
To prevent corrosion, the combustion air must not contain
any corrosive substances. Substances classed as corrosion-
promoting include halogenated hydrocarbons such as are
found in solvents, paints, adhesives, aerosol propellants and
various household cleaners. Appropriate measures should
be taken where necessary.
With the exception of the flue pipe, the surface temperature
of the appliance is below 85 °C. No special safety measures
are therefore necessary.
Site appliance as shown in Fig. 5.
Always site appliance in a location not exposed to
temperatures below freezing. If this is not possible, the
appliance must be switched off and drained and the batteries
removed whenever there is a risk of freezing.
Danger: the appliances are designed to prevent flame reflow.
In case you suspect anything unusual in the appliance
operation, please shut down gas and water cocks, and call
an approved technician to check the local conditions.
To prevent flame reflow in outdoor installations please make
sure that a wind/rain protection is fitted.
To prevent flame reflow in indoor installations please make
sure that a wind/rain protection is fitted at the end of the
secondary flue.

Fixing the appliance

Remove the temperature control and the output control.
Remove the outer case by sliding it forwards and then lifting
Fix the appliance using the sleeves and hooks supplied so
that it is vertical.
Never allow the appliance to rest against water or gas

Water connection

It is advisable to drain the appliance before installing it as
any dirt or grit inside it could reduce the water flow rate and,
in extreme cases, could completely clog up the appliance.
Mark hot water and cold water pipes so as to prevent
Connect pipe to automatic water valve using the connecting
kit supplied.
To prevent problems caused by sudden pressure fluctuations
in the water supply, it is advisable to fit a non-return valve to
the water outlet.

Gas connection

Take care to ensure dirt is not allowed to enter gas inlet.
Make sure that the type of gas specified on the appliance
type plate is the same as that supplied by the gas authorities.
6 720 607 527
Select pipe diameter to suit output of instantaneous water
heater being installed.
Fit gas service cock as close to appliance as possible.
Caution: This is a low pressure gas appliance. A SA certified
2.8 kPa low pressure regulator must be fitted.


It is absolutely essential that all instantaneous water heaters
are connected to a suitably dimensioned flue pipe by means
of a gas-tight connection.
The flue pipe should be made of galvanised iron, aluminium,
stainless steel or fibre concrete. Fit as shown in Fig. 5.
A flexible or rigid pipe should be used, fit it inside the flue
socket. The external diameter of the pipe should be slightly
smaller than the dimension specified in the appliances
dimensions table.


Turn on the gas and water cocks and check all connections
for leaks.
The two 1.5 V type R batteries supplied must be correctly
fitted (Fig. 6).
Check flue gas safety device good functioning, proceed as
explained in section 3.5.
Fig. 5

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