Bosch 7736502488, 7736502490, 7736502489, 7736502487, 7736502496 Product Sheet

Bosch OptiFlow
Professional Internal

Room-sealed continuous flow

water heater and flue components

The OptiFlow Professional

Internal offers:

3 6 Star efficiency

3 Room sealed appliance

3 Inbuilt temperature controller

3 Electronically controlled modulation

3 50°C locked models available

2 | OptiFlow Professional flue install instructions

O100

O60

>10 >10

80

240

583

B

A C

Bosch OptiFlow
Professional Internal

3 Room sealed appliance
3 Inbuilt controller
3 6 star efficiency

Technical Features Units 12L 16L 20L

Performance

Maximum gas consumption MJ 90.0 120.2 149.0

Minimum gas consumption MJ 11.9 18.0 18.0

Efficiency at 100% of nominal load % 82.4 82.4 82.4

Data relating to gas – Gas operating pressure

Natural gas kPa 1.13 1.13 1.13

LP gas kPa 2.75 2.75 2.75

Data relating to the water

Maximum admissible pressure kPa 1000 1000 1000

Minimum operating pressure kPa 100 100 100

Start up flow @ 15°C inlet water
temperature

Maximum flow, corresponding to
a temperature increase of 25OC

Maximum inlet temperature °C 80 80 80

Temperature locked model available
(adjustable to deliver 50°C at tap)

Electrical circuit

Power supply voltage VAC 230 230 230

Maximum power consumption W 100 100 100

Warranty Details (Domestic)

Parts and Labour Years 3 3 3

Heat Exchanger only Years 12 12 12

OptiFlow Professional Internal models Bosch Part Number

55°C set 12L/minute NG model 7736502487

55°C set 12L/minute LPG model 7736502488

50°C locked 12L/minute NG model 7736502489

50°C locked 12L/minute LPG model 7736502490

55°C set 16L/minute NG model 7736502495

55°C set 16L/minute LPG model 7736502496

50°C locked 16L/minute NG model 7736502497

50°C locked 16L/minute LPG model 7736502498

55°C set 20L/minute NG model 7736502499

55°C set 20L/minute LPG model 7736502500

50°C locked 20L/minute NG model 7736502501

50°C locked 20L/minute LPG model 7736502502

l/min 2.0 2.0 2.0

l/min 12.0 16.0 20.0

Yes Yes Yes

Measurements (mm) A B C

12L model 300 570 170

16L model 364 570 175

20L model 364 570 175

Connections

Water Gas

Cold Hot NG LPG

15mm (1/2”) 15mm (1/2”) 15mm (1/2”) 15mm (1/2”)

OptiFlow Professional flue install instructions | 3

What you need to know

WHICH TYPE OF FLUE TO USE

Bosch OptiFlow Professional flue must be used with these appliances. Any installations with the incorrect flue will not
be approved and could pose a risk.

The flue used for the Bosch OptiFlow Professional is a 60/100 Ø coaxial flue. This flue allows the appliance to draw air
in from outside, and expel flue gas back outside, making the appliance room sealed.

THE FLUE MATERIALS USED

Inner and outer layers are extruded aluminium. The outer layer is painted white.

CUTTING THE FLUE TO LENGTH

Flue extensions can be cut to length. Care should be taken to remove burrs to maintain the integrity of the seal to the
adjoining fitting.

STRAIGHT FLUE LENGTH TABLE

12/16L 20L

Maximum vertical flue length 12m 8m

Maximum horizontal flue length 10m 6m

REDUCTION IN LENGTHS FOR BENDS

For every bend added to a flue configuration, the maximum acceptable flue length will reduce by the amount shown below

Flue Bend reduction Table

45° Bend 1m

90° Bend 2m

CONDENSATE TRAPS

Condensate is more likely to form in longer lengths of flue, or when outside ambient air temperature is low. The table
below shows the length and temperature combinations when a condensate trap should be used.

Condensate trap kits are supplied with all components required for installation.

10m

FLUE LENGTH

9m

8m

7m

6m

5m

4m

3m

2m

1m

-100C -50C 00C 50C 100C 150C 200C 250C

3

8

LOWEST OUTSIDE AIR TEMPERATURE