Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N Applications, Introduction, Pump Sizing

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Appliance details

2.6Applications

Caution: the water heater which will be used to supply potable water shall not be connected to any heating system or component(s) previously used with a nonpotable water heating appliance.

Introduction

The application designs provided in this manual are general guides to be used when installing this recirculating water heater.

Pump Sizing

Required PS pumps are Taco 007 Bronze or Grundfos 15-42B. PZ pumps should be sized by a professional plumb- ing contractor based on the specific application.

Caution: Do not overpump the heater. Maximum 5 gpm water flow permitted through the heater.

Instantaneous water heater (direct tank load design)

Note: maximum amp draw: 1,5A. Do not connect additional pump to the appliance but use a relay panel if powering multiple pumps.

Fig. 6

Front cover

Low voltage access cover

Control panel

Fig. 7 Service position to access water and electric connections

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Contents Temperature Modulated with Electronic Ignition What to do if you smell gasIndex For your safetyIndex FCC Appliance details FeaturesGWH-345/450-ESR Specifications Technical data Unpacking the GWH-345/450-ESR heater Appliance details Water resistantInlet air restrictors GWH-345/450-ESR is not approved or designed forGeneral rules to follow for safe operation Dimensions and minimum installation clearances DimensionsApplications IntroductionPump Sizing Instantaneous water heater direct tank load designPressure InletWater flow rate Water qualityInstallation instructions Proper location for installing your heaterHeater placement and clearances Mounting installationCombustion air requirements Twin pipeSingle pipe Appliances located in unconfined spaces720 607 Vent lengths Vent material and specificationsVenting Vent Safety System Vent materialExhaust vent connection Installation instructions Selecting inlet air restrictor ExhaustIntake ExampleCombustion air inlet connection Mounting sequenceInstallation instructions Condensate drain requirements Room sealed installation Twin pipeVent terminations Interior masonry chimneysExterior Masonry Chimney Horizontal terminations720 607 Description Minimum distance Horizontal side wall venting installation Gas piping & connections GAS ConnectionsFor Natural GAS Measuring gas pressure Checking restrictor plate size by measuring CO2 level valueWater connections Electrical connectionsFor your safety read before operating your water heater Operating instructionsInitial filling instructions Operating instructionsPower Recirculating water temperatureTemperature and hot water flow Freeze protectionElectrical diagram Electrical schemeMaintenance and service Service modeParameter 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 DiagramParts list Description ReferenceProtecting 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.