Bosch Appliances GWH-345/450-ESR-N Unpacking the GWH-345/450-ESR heater, Inlet air restrictors

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Appliance details

Water resistant

IP X4 (protection against water drops)

2.3Unpacking the GWH-345/450-ESR heater

This heater is packed securely.

The box includes:

Wall-mounted gas fired recirculating water heater

Bracket and screws for wall hanging the heater

Exhaust vent adaptor (with 4 screws and gasket provided)

Combustion air inlet adaptor (with 4 screws and gasket provided)

Installation manual

Product registration card

Energy Guide label

Pressure relief valve

Inlet air restrictors

GWH 345 ESR N: Ø38/40/42

GWH 345 ESR LP: Ø38/40/42

GWH 450 ESR N: Ø44/47/50/55

GWH 450 ESR LP: Ø47/50/55/60

Do not lose this manual. Please complete and return the enclosed product registration card.

Before installing the unit, be certain you have the correct heater for your type of Gas - Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover.

To remove front cover

The front cover is secured with two

iscrews to prevent unauthorized access. Always secure the control panel and front cover with these screws.

B Loosen the two Philips head screws located as shown in fig. 2.

Fig. 2 Screws

B Pull control panel outwards and then pull it downwards (Fig. 3).

Front cover

Low voltage access cover

Control panel

Fig. 3 Service position to access water and electric connections

BLift front cover upward and remove.

The GWH-345/450-ESR is not approved or designed for:

Manufactured (mobile) homes, RV's or boats

Outdoor installation

Combination venting with other appliances

Closed loop heating applications.

6 720 607 909

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Contents What to do if you smell gas Temperature Modulated with Electronic IgnitionIndex For your safetyIndex FCC Appliance details FeaturesGWH-345/450-ESR Specifications Technical data Appliance details Water resistant Unpacking the GWH-345/450-ESR heaterInlet air restrictors GWH-345/450-ESR is not approved or designed forGeneral rules to follow for safe operation Dimensions Dimensions and minimum installation clearancesIntroduction ApplicationsPump Sizing Instantaneous water heater direct tank load designInlet PressureWater flow rate Water qualityProper location for installing your heater Installation instructionsHeater placement and clearances Mounting installationTwin pipe Combustion air requirementsSingle pipe Appliances located in unconfined spaces720 607 Vent lengths Vent material and specificationsVenting Vent material Vent Safety SystemExhaust vent connection Exhaust Installation instructions Selecting inlet air restrictorIntake ExampleMounting sequence Combustion air inlet connectionRoom sealed installation Twin pipe Installation instructions Condensate drain requirementsInterior masonry chimneys Vent terminationsExterior Masonry Chimney Horizontal terminations720 607 Description Minimum distance Horizontal side wall venting installation GAS Connections Gas piping & connectionsFor Natural GAS Checking restrictor plate size by measuring CO2 level value Measuring gas pressureElectrical connections Water connectionsOperating instructions For your safety read before operating your water heaterInitial filling instructions Operating instructionsRecirculating water temperature PowerTemperature and hot water flow Freeze protectionElectrical scheme Electrical diagramService mode Maintenance and serviceParameter storage Maintenance and service Mode Parameter ValuesExiting service mode Fault Indication Possible Cause Check TroubleshootingTroubleshooting Check air vent GWH-345/450-ESR Functional scheme GWH-345/450-ESR Functional schemeInterior components Interior components diagram and parts listInterior components diagram and parts list Components Diagram Components diagramDescription Reference Parts listProtecting the environment Protecting the environmentPacking ComponentsTen Year Limited Warranty Bosch Thermotechnology Corporation

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.

Both models come equipped with advanced safety features. The integrated combustion management system ensures precise control of the combustion process, which not only enhances heating efficiency but also reduces the risk of overheating. Additionally, the built-in safety mechanisms, such as flame failure protection and overheat protection, provide consumers with peace of mind knowing their home is protected.

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.