Bosch W 135 K..B, W 275 1 K.B., W 400-1K..B, W 350 1 K.B. Installation, Servicing And User Instructions Manual

For your safety

If you smell gas:

- Turn off gas isolating valve;

- Open windows to increase air circulation;

- Do not operate any electrical switches;

- Do not use the telephone on the premises;

- Call an authorised technician or the local gas authority
immediately.

Installation and servicing should only be performed
by authorised personnel.

Regular maintenance is recommended to ensure correct
and safe performance.

Do not store or use inflammable liquids or materials near
the appliance.

If the appliance is installed in a position likely to be affected
by frost, isolate gas and water supplies, remove batteries
and drain. If problems occur call an authorised technician
immediately.

The installer should explain to the customer how the
appliance functions and how to operate it. A copy of these
instructions must be made available to him.

W 135 K.B..
W 275 - 1 K.B..
W 350 - 1 K.B..
W 400 - 1 K.B..

Gas Fired Instantaneous
Water Heaters

Installation, Servicing and User Instructions

With electronic ignition and
ionisation probe safety
system

6 720 605 351 PT 1999.11

2

1.1 Dimensions

1 - Front cover
41 - Gas inlet
42 - Gas inlet (W135... Ø 3/4")
7 - Gas valve assembly
8 - Water valve assembly
10 - Temperature selector
12 - Heat exchanger
13 - Chimney with draught

diverter

Fig. 1

D663_014

22 - Output slide control
120 - Ignition unit
116 - Battery box
96 - Micro-switch
126 - Position of back

panel mounting slots
128 - Flue pipe connection
129 - Back panel

1.2 Technical Data

1. Main Features and Technical Data

*Hi 15°C - 1013 mbar - dry: Butane = 45.72 MJ/kg (12,7kWh/kg) - Propane = 46.44 MJ/kg (12,9 kWh/kg)
** Even with the effects of water dilation, the water pressure in the appliance shall not exceed this value.

W 135 K..B

W 275/350/400 K..B

Dimensions

(mm)

ABCDEFG

W 135 K..B..

270 610 138 ---- ---- ---- ---- ø3/4"

W 275-1K..B..

360 680 228 110 423 227 25 ø3/4"

W 350-1K..B.. 400 755 228 132 460 233 30 ø3/4"
W 400-1K..B..

460 755 334 132 512 182 30 ø3/4"

Gas connection

Ø

Appliance Ratings Symbols Units W 135..B W 275-1..B W 350-1..B W 400-1..B

Nominal useful output

P

n

kW 9.4 19.2 24.4 27,9

Minimum useful input (based on net c.v.)

P

min

kW 4.7 9.6 12.2 14
Manual useful output range kW 4.7-9.4 9.6-19.2 12.2-24.4 14-27.9
Nominal heat input

Q

n

kW 11.2 21.8 27.9 32.1
Minimum heat input

Q

min

kW 5.6 10.9 14 16.1

Gas inlet pressure

LP gas (Butane/Propane)* - 3+ G30/31 mbar 28/37 28/37 28/37 28/37

Gas consumption

LP gases - (Butane/ Propane)* kg/h 0.85 1.7 2.2 2.5

Water data **

Maximum inlet water pres sure

p

w

bar 12 12 12 12
Water flow selector

right

Min. water flow l/min. 2.5 5 5.9 7.3
Temperature rise °C55 555555

Min. inlet water pressure

p

wmin

bar 0.15 0.15 0.2 0.2
Water flow selector

left

Min. water flow l/min 5.4 11 14 16
Temperature rise °C25 252525
Min. inlet water pressure bar 0.6 0.5 0.8 1.2

CATEGORY

II

2H3+

TYPE

B

11BS