Bosch GWH 345 ESR Gebrauchsanweisung

Applications manual

For GWH 345 ESR and GWH 450 ESR tankless water heaters

2| GWH 345/450 ESR applications manual

Application manual | 02.2009 BOSCH THERMOTECHNOLOGY CORPORATION

Applications manual | 02.2009BOSCH THERMOTECHNOLOGY CORPORATION

GWH 345/450 ESR applications manual | 3

Table of Contents

1 Introduction 4

2 Bosch Water Heating Models 5

2.1 Bosch GWH 345 ESR 5

2.2 Bosch GWH 450 ESR 6

3 External storage tank loading applications 7

3.1 GWH 345/450 ESR pressure drops & circulator guidelines 7

3.2 Tank loading diagrams 8

4 Open Loop Space Heating 10

5.1 External storage tank 10

5.2 Indirect tank applications 20

4| GWH 345/450 ESR applications manual

Application manual | 02.2009 BOSCH THERMOTECHNOLOGY CORPORATION

1 Introduction

The Applications Manual is intended to present some of the most

common applications of the Bosch GWH 345 ESR and GWH 450 ESR

tankless water heaters. Application drawings are shown with both

piping and corresponding electrical schematics where applicable.

Auxiliary equipment depicted does not necessarily represent any

one manufacturer or speciﬁc model number. There are a wide

variety of techniques, practices and piping strategies possible when

installing water heating appliances. It is the responsibility of the

installing contractor to determine the most suitable arrangement for

the application.

All drawings are conceptual in nature and does not address

all design, installation or safety considerations. Additional

safety and/or auxiliary equipment may be needed.

Drawings are for reference use by ofﬁcials, designers and

licensed installers. It is expected that installers have

adequate knowledge of accepted industry practices for the

equipment, procedures, and applications involved. It is the

responsibiltiy of the installer to ensure that the installation

is in accordance with local building codes.

Although this manual covers many common applications for our

products, system possibilities are virtually endless. Should you

encounter an application that is not covered in this manual or have

any questions regarding any of its content, we encourage you to

contact your local sales representative or us directly at Bosch

Thermotechnology.

This is not a substitute for any of the product’s installation manuals.

All speciﬁcations subject to change.

Installation must conform with local codes or, in the absence of

local codes, the National Fuel Gas Code ANSI Z 223.1/NFPA 54.

In Canada: Installation must conform with CGA B149.(1,2)

INSTALLATION CODES and/or local installation codes.

Applications manual | 02.2009BOSCH THERMOTECHNOLOGY CORPORATION

GWH 345/450 ESR applications manual | 5

2 Bosch Water Heating Models

2.1 Bosch GWH 345 ESR

Features:

XSpeciﬁcally designed for recirculating applications

XElectronic ignition and built in power vent

XGWH 345 ESR thermal efﬁciency of 82%

XVents vertically or horizontally with 3" stainless steel (AL29-4C)

XDirect vent room-sealed combustion

XComputerized temperature control — ensures temperature

stability

XModel GWH 345 ESR N for natural gas (NG) supply

XModel GWH 345 ESR L for liquid propane (LP) supply

X10-year warranty on heat exchanger

GWH 345 ESR Technical Speciﬁcations

Gas input 32,000 - 95,000 Btu/h

Maximum ﬂow rates 3.5gpm @ 45°F rise

Thermal Efﬁciency 82%

Dimensions 27.5" h x 15.75" w x 11.75" d

Weight 47 lbs.

Modulating gas valve yes

Ignition Electronic

GWH 345 ESR Installation Speciﬁcations

Gas connection ¾" Male NPT

Water connections ¾" Male NPT

NG gas pressure Minimum: 5.5" W.C.

Maximum: 14" W.C.

LP gas pressure Minimum: 11" W.C.

Maximum: 14" W.C.

Electrical supply 120VAC - plugs in

Venting 3" stainless steel (AL29-4C)

direct vent

room-sealed combustion

GWH 450 ESR Installation Clearances

Top (A) 12"

Front (B) 1"

Back 0"

Sides 1"

Floor (C) 12"

Fig. 1 Venting conﬁgurations

Installation guidelines:

Venting:

XMust be 3" or 4" AL29-4C sealed stainless steel vent pipe.

XSlope horizontal runs up to termination ¼" per foot. The

horizontal section between last elbow and termination must slope

down to the termination ¼" per foot.

XDo not combination vent with any other appliance.

XAlways install an external condensate drain except when

terminating horizontally with less than 3 feet of pipe.

XSee manual for vent terminator clearances.

Gas piping:

XHeater will not function properly without adequate supply gas

pressure.

XAny appliance connector should be ¾" minimum diameter.

Plumbing:

XInstall the included pressure relief valve and pipe to suitable

drain.

XMinimum piping diameter is ¾".

XDo not solder directly to the bottom of the unit.

XUse unions to facilitate easy future maintenance.

XUse full port ball valves or isolation valves.

XPartially ﬁll condensate drain tube loop with water prior

to start up.

6| GWH 345/450 ESR applications manual

Application manual | 02.2009 BOSCH THERMOTECHNOLOGY CORPORATION

2.2 Bosch GWH 450 ESR

Features:

XSpeciﬁcally designed for recirculating applications

XElectronic ignition and built in power vent

XGWH 450 ESR thermal efﬁciency of 81%

XVents vertically or horizontally with 3" stainless steel (AL29-4C)

XDirect vent room-sealed combustion

XComputerized temperature control — ensures temperature

stability

XModel GWH 450 ESR N for natural gas (NG) supply

XModel GWH 450 ESR L for liquid propane (LP) supply

X10-year warranty on heat exchanger

GWH 450 ESR Technical Speciﬁcations

Gas input 45,000 - 120,000 Btu/h

Maximum ﬂow rates 4.5gpm @ 45°F rise

Thermal Efﬁciency 81%

Dimensions 27.5" h x 15.75" w x 11.75" d

Weight 47 lbs.

Modulating gas valve yes

Ignition Electronic

GWH 450 ESR Installation Speciﬁcations

Gas connection ¾" Male NPT

Water connections ¾" Male NPT

NG gas pressure Minimum: 5.5" W.C.

Maximum: 14" W.C.

LP gas pressure Minimum: 11" W.C.

Maximum: 14" W.C.

Electrical supply 120VAC - plugs in

Venting 3" stainless steel (AL29-4C)

direct vent

room-sealed combustion

GWH 450 ESR Installation Clearances

Top (A) 12"

Front (B) 1"

Back 0"

Sides 1"

Floor (C) 12"

Fig. 1 Venting conﬁgurations

Installation guidelines:

Venting:

XMust be 3" or 4" AL29-4C sealed stainless steel vent pipe.

XSlope horizontal runs up to termination ¼" per foot. The

horizontal section between last elbow and termination must slope

down to the termination ¼" per foot.

XDo not combination vent with any other appliance.

XAlways install an external condensate drain except when termi-

nating horizontally with less than 3 feet of pipe.

XSee manual for vent terminator clearances.

Gas piping:

XHeater will not function properly without adequate supply gas

pressure.

XAny appliance connector should be ¾" minimum diameter.

Plumbing:

XInstall the included pressure relief valve and pipe to suitable

drain.

XMinimum piping diameter is ¾".

XDo not solder directly to the bottom of the unit.

XUse unions to facilitate easy future maintenance.

XUse full port ball valves or isolation valves.

XPartially ﬁll condensate drain tube loop with water prior

to start up.

Applications manual | 02.2009BOSCH THERMOTECHNOLOGY CORPORATION

GWH 345/450 ESR applications manual | 7

3 External storage tank loading applications

Introduction

This section outlines tank loading options for high volume water

heating for large residential and light commercial applications

including continuous ﬂows and high volume demands of large home

and commercial applications.

3.1 GWH 345/450 ESR pressure drops and circulator

guidelines

XThe maximum amp draw for any circulator connected directly to

the appliance must not exceed 1.5 amps

XCirculator should be sized by the professional plumbing

contractor

XBronze or stainless steel circulators are required for all open loop

applications

Pressure drop curves

Note : Flow above 6 GPM is not permitted.

GWH 345 ESR

0 feet of head

10 feet of head

20 feet of head

30 feet of head

0 GPM 1 GPM 2 GPM 3 GPM 4 GPM 5 GPM 6 GPM

water flow rate

head loss

GWH 450 ESR

0 feet of head

10 feet of head

20 feet of head

30 feet of head

0 GPM 1 GPM 2 GPM 3 GPM 4 GPM 5 GPM 6 GPM

water flow rate

head loss

8| GWH 345/450 ESR applications manual

Application manual | 02.2009 BOSCH THERMOTECHNOLOGY CORPORATION

3.2 Tank Loading diagrams

3.2.1 Single unit tank loading application plumbing diagram

The GWH 345/450 ESR is speciﬁcally designed for this application

Symbols

Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.

Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.

It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.

Drawing is not to scale.

Drawing # STL CN revA 10/07

Service

valves

Bronze circulator sized

according to UPC standards

Potable water

expansion tank

Bosch GWH 345 ESR,

Bosch GWH 450 ESR

Flow

direction

Note: Piping to fixtures not shown for clarity purposes.

Cold water

feed DHW

Pressure

relief

valve

External

storage

tank

12K ohm

thermistor

with immersion

well

Applications manual | 02.2009BOSCH THERMOTECHNOLOGY CORPORATION

GWH 345/450 ESR applications manual | 9

3.2.2 Single unit tank loading application electrical diagram

The following shows the appropriate electrical connections for

plumbing diagram 3.2.1

Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.

Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.

It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.

Drawing is not to scale.

Drawing # ESTL CN revA 10/07

Single Unit Tank Loading

Electrical Diagram

L N

N L

ESR control

board

Terminal box

110VAC from outlet

PCB

10 | GWH 345/450 ESR applications manual

Application manual | 02.2009 BOSCH THERMOTECHNOLOGY CORPORATION

4 Open Loop Space Heating

Introduction

This section is designed to provide techniques for using a recirculat-

ing tankless water heater to heat domestic water and provide space

heating in residential applications. As with all installations, check

with the local authority having jurisdiction. Some jurisdictions may

not allow these types of applications.

Symbols

Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.

Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.

It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.

Drawing is not to scale.

Drawing # ROL CN revA 10/07

Service

valves

Bronze circulator

sized according to

UPC standards

Potable water

expansion tank

Flow

direction

Note: Piping to fixtures not shown for clarity purposes.

Bosch GWH 345 ESR,

Bosch GWH 450 ESR

Cold water

feed

DHW

Pressure

relief

valve

Storage

tank

Thermostatic

mixing

valve

Radiant

piping

12K ohm

thermistor

with immersion

well

Air

separator

4.1 External storage tank

The appliances shown in this section are approved under ANSI

Z21.10.3 and CSA 4.3 as circulating gas water heaters. Only open

loop applications are approved under this standard.

4.1.1 Radiant space heating and DHW plumbing diagram

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