Installation instructions

3.6Venting

Danger: Do not combination vent this appliance with any other appliance.

Warning: Do not reduce the vent (exhaust and combustion) pipe sizes.

Warning: Failure to vent the exhaust gases to the outside with sealed stainless steel vent pipe (AL29-4C) may result in dangerous flue gases filling the structure in which it is installed.

Warning: Do not mix vent pipe or joining methods from different manufacturers.

Caution: The vent system must be installed by a qualified individual or agency in accordance with these instructions. If improperly installed, a hazardous condition such as fire or carbon monoxide poisoning could result. Bosch Thermotechnology Corp. will not be responsible for improperly installed appliances.

3.6.1Vent material and specifications

Establish vent clearances that comply with the vent manufacturer's specifications. In all cases follow local codes.

Note: Listed thimbles or collars are necessary to pass through wall and ceiling partitions. If the vent system passes through combustible areas where the vent clearance requirements cannot be maintained, it is permissible to chase straight sections of sealed 3 inch single wall vent through 4 inch (or greater) Type-B vent. The distance to combustibles using this chase technique is 1 inch.

Warning: Type-B vent should never be used as the actual exhaust vent system for the appliance, as it is not gas tight.

Vent lengths

The appliance should be located as close to the point of termination as possible.

The maximum equivalent exhaust length is 39 feet with one 90 degree elbow. Subtract 6 feet for each additional 90 degree elbow used (a maxi-

mum of four elbows are permitted in the exhaust vent)1).

The maximum equivalent inlet air supply pipe

length is 39 feet with one 90 degree elbow. Sub- tract 3 feet for each additional 90 degree elbow used (a maximum of four elbows are permitted in the inlet air supply)2).

Horizontal section of vent must pitch upward from heater 1/4" for every foot of horizontal length, to prevent the pooling of condensate, and be supported at 4 foot intervals with overhead hangers. See Table 3. The last horizontal run including the termination must be sloped to the outside 1/4" per foot to prevent rain from entering the venting system.

 

Diam.

Max.

Material

 

 

equivalent

 

 

 

length

 

Exhaust

3 inches

39 feet with

Sealed stainless

Vent

 

1 elbow

steel (AL29-4C)

Intake

3 inches

39 feet with

Aluminum flex,

Vent

 

1 elbow

PVC or any other

 

 

 

rigid or semi rigid

 

 

 

sealed 3” pipe

Table 3 Venting Specifications

 

 

The minimum exhaust vent length is

 

3 feet.

 

 

The use of a 90 degree elbow is

 

equivalent to 6 ft in vent length.

 

The use of 45 degree elbow is

 

equivalent to 3 ft in vent length.

Fig. 12 Minimum exhaust vent length

1)or subtract 3 feet for each 45° elbow used

2)or subtract 1.5 feet for each 45° elbow used

6 720 607 909

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Bosch Appliances GWH-345/450-ESR-N, GWH-345/450-ESR-L manual Venting, Vent material and specifications, Vent lengths
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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.

One of the standout features of the GWH-345/450-ESR series is their impressive energy efficiency. Engineered with cutting-edge technology, these units operate with high thermal efficiency ratings. This not only translates to reduced energy bills for consumers but also supports environmentally friendly practices by minimizing energy consumption. The tankless design eliminates the need for a storage tank, providing hot water on demand while ensuring that no energy is wasted in heating and re-heating stored water.

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These Bosch water heaters also feature a user-friendly digital display that allows for easy temperature adjustment and monitoring. The intuitive interface enables users to set their desired water temperature with precision, ensuring comfort and convenience. Furthermore, these models are designed for quiet operation, making them suitable for installation in various locations within the home without causing disruptive noise.

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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