Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual Appliance details, Features

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Appliance details

2Appliance details

2.1Features

Parts

• Sealed combustion burner.

Safety

•Ionization flame sensor

•Over temperature protection.

High quality materials for long working life

•Copper heat exchanger

•Compact space saver: mounts on a wall with supplied bracket.

Features

•LCD screen to display temperatures, burner operation and error codes

•On/Off button and separate temperature controls for domestic water heating and recirculating water

•Reset button

•Failure codes for diagnostics and repair

•Freeze prevention cycle.

BOSCH is constantly improving its

iproducts, therefore specifications are subject to change without prior notice.

2.2GWH-345/450-ESR Specifications (Technical data)

Approved in US/Canada

Capacity

GWH345 Maximum flow rate: 3.5 GPM (13 l/min) at a 45°F (25°C) rise.

GWH450 Maximum flow rate: 4.5 GPM (17 l/min) at a 45°F (25°C) rise.

Maximum output

GWH345 - 77,900 Btu/h (22.8 kW)

GWH450 - 98,400 Btu/h (28.8 kW)

Maximum input

GWH345 - 95,000 Btu/h (27.8 kW)

GWH450 - 120,000 Btu/h (35.1 kW)

Efficiency in %

GWH345 Combustion efficiency: 82%

GWH450 Combustion efficiency: 81%

Min. Output

GWH345 - 23,900 Btu/h (7 kW)

GWH450 - 35,500 Btu/h (10.4 kW)

Temperature Control

Selection range: 115°F (45°C) - 190°F (90°C)

Gas Requirement

Gas connection (inches) - ¾”

Inlet gas pressure under operation (with a high hot water flow rate)*

•Propane: 11” - 14” water column

•Natural Gas: 5.5” - 8” water column.

*To measure gas pressure, see Measuring Gas Pressure, chapter 3.8.

Venting

3" AL 29-4C single wall sealed stainless steel vent pipe.

See chapter 3.6 for Venting.

Water

•Hot water connection - ¾” NPT

•Cold water connection - ¾” NPT.

Combustion

•NOx ≤ 100 ppm

•CO ≤ 250 ppm

•CO2 level (see table 8 for correct restrictor dimension).

Dimensions

•Depth (in): 11 ¾” (300 mm)

•Width (in): 15 ¾” (400 mm)

•Height (in): 27 ½” (700 mm)

•Weight: 47 pounds (21 kg).

Gas types

Natural Gas.

Liquid Propane.

The appliance is not field convertible.

Voltage

120 V AC (50/60 Hz)

Amperage

Idle - 40 mA

Operation - ≤ 1.5 A

Noise

≤50 db (A)

Safety devices

•Flame failure device (Ionization flame control)

•Overheat prevention (temperature limiter)

•Pressure switch (blocked vent protection).

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Contents Temperature Modulated with Electronic Ignition What to do if you smell gasIndex For your safetyIndex FCC GWH-345/450-ESR Specifications Technical data FeaturesAppliance details 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 Venting Vent material and specificationsVent lengths 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 modeExiting service mode Maintenance and service Mode Parameter ValuesParameter storage Troubleshooting TroubleshootingFault Indication Possible Cause Check Check air vent GWH-345/450-ESR Functional scheme GWH-345/450-ESR Functional schemeInterior components diagram and parts list Interior components diagram and parts listInterior components 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.
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