Installation instructions

Selecting inlet air restrictor

Note: Before installing the combustion air inlet accessory, the appropriate inlet air restrictor must be determined using Tables 6, 7 and 8.

Refer to Fig. 15 for mounting sequence.

BDetermine the total length of the straight sections of 3" stainless steel exhaust and enter that length in line 1.

BCount the number of 90° elbows used and enter that value in line 2.

BCount the number of 45° elbows used and enter that value in line 3.

BFor model GWH 345 ESR, enter a 1 in line 4 for model GWH 450 ESR enter a 1 in line 5.

BRepeat steps 1 through 4 for the 3" intake pipe and enter those values in the intake section.

BAdd the totals from the Exhaust table and the Intake table to determine the equivalent vent length. Use this value in Table 6 to determine which restrictor size to use.

Exhaust

1

Straight section length

__ x 1 =

____

 

 

 

 

2

90° elbows (qty)

__ x 6 =

____

 

 

 

 

3

45° elbows (qty)

__ x 3 =

____

 

 

 

 

4

GWH 345 ESR termination

__ x 15 =

____

 

 

 

 

5

GWH 450 ESR termination

__ x 12 =

____

 

 

 

 

6

 

Total:

____

 

 

 

 

Intake

 

 

 

 

 

 

1

Straight section length

__ x .5 =

____

 

 

 

 

2

90° elbows (qty)

__ x 3 =

____

 

 

 

 

3

45° elbows (qty)

__ x 1.5

____

 

 

 

 

4

GWH 345 ESR termination

__ x 6 =

____

 

 

 

 

5

GWH 450 ESR termination

__ x 3 =

____

 

 

 

 

6

 

Total:

____

 

 

 

7

Total equivalent vent length =

____

 

 

 

 

Table 6 Determining equivalent vent length (see example in Table 7)

Example

Exhaust

•10 - 3' straight sections

•1 - 1' straight section

Total length 31'

•1 - 90° elbow

•1 - GWH 450 ESR termination.

Intake

•5 - 4' straight sections

•2 - 1' straight sections

Total length 22'

•2 - 90° elbows

•1 - GWH 450 ESR termination.

Example

Exhaust

Straight section length

21 x 1 =

21

 

 

 

90° elbows (qty)

1 x 6 =

6

 

 

 

45° elbows (qty)

0 x 3 =

0

 

 

 

GWH 345 ESR termination

0 x 15 =

0

 

 

 

GWH 450 ESR termination

1 x 12 =

12

 

 

 

 

Total:

39

 

 

 

 

Intake

 

 

 

 

 

 

Straight section length

22 x .5 =

11

 

 

 

90° elbows (qty)

2 x 3 =

6

 

 

 

 

45° elbows (qty)

0 x 1.5

=

0

 

 

 

 

GWH 345 ESR termination

0 x 6

=

0

 

 

 

 

GWH 450 ESR termination

1 x 3

=

3

 

 

 

 

Total:

20

 

 

Total equivalent vent length =

59

 

 

 

 

Table 7 Determining equivalent length example

Using table 8, the following restrictors would be required:

•GWH 450 ESR NG - restrictor 55

•GWH 450 ESR LP - restrictor 55.

16

6 720 607 909

Page 15 Page 17
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Image 16
Bosch Appliances GWH-345/450-ESR-L Installation instructions Selecting inlet air restrictor, Exhaust, Intake, Example
Page 15 Page 17

GWH-345/450-ESR-L, GWH-345/450-ESR-N specifications

Bosch Appliances has long been recognized for its innovative and high-quality home appliances, and the GWH-345/450-ESR-N and GWH-345/450-ESR-L water heaters are no exception. These models offer exceptional efficiency and reliability, making them ideal choices for modern households seeking dependable water heating solutions.

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The construction of the GWH-345/450-ESR-N and GWH-345/450-ESR-L models is robust, featuring high-quality materials that ensure durability and longevity. The compact and sleek design allows for flexible installation options, even in smaller spaces. With a variety of venting options available, including direct vent and power vent configurations, these heaters can fit seamlessly into different home layouts.

In summary, Bosch Appliances GWH-345/450-ESR-N and GWH-345/450-ESR-L models represent the pinnacle of modern water heating technology. With their energy-efficient performance, advanced safety features, user-friendly controls, and durable construction, these water heaters are designed to meet the demands of today’s homes while delivering reliable hot water whenever needed. These innovative appliances reinforce Bosch's reputation as a leader in home heating solutions, ensuring that customers can enjoy hot water with confidence and peace of mind.
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