Bosch Appliances GWH 425 PN/HN4GWH 4254, GWH 260 PN/HN2 manual GWH 345 ESR Technical Specifications

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Applications manual

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2.6 Bosch GWH 345 ESR

Features:

Specifically designed for recirculating applications Electronic ignition and built in power vent

GWH 345 ESR thermal efficiency of 82%

Vents vertically or horizontally with 3" stainless steel (AL29-4C) Direct vent room-sealed combustion

Computerized temperature control — ensures temperature stability

Model GWH 345 ESR N for natural gas (NG) supply Model GWH 345 ESR L for liquid propane (LP) supply 10-year warranty

GWH 345 ESR Technical Specifications

Gas input

GWH 345 ESR: 32,000 - 95,000 Btu/h

 

 

Maximum flow rates

GWH 345 ESR: 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:

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

Slope horizontal runs up to termination ¼" per foot. The horizon- tal section between last elbow and termination must slope down to the termination ¼" per foot.

Do not combination vent with any other appliance.

Always install an external condensate drain except when termi- nating horizontally with less than 3 feet of pipe.

See manual for vent terminator clearances.

Gas piping:

Heater will not function properly without adequate supply gas pressure.

Any appliance connector should be ¾" minimum diameter

Plumbing:

Install the included pressure relief valve and pipe to suitable drain.

Minimum piping diameter is ¾".

Do not solder directly to the bottom of the unit. Use unions to facilitate easy future maintenance. Use full port ball valves for isolation valves.

Partially fill condensate drain tube loop with water prior to start up.

Bosch Water Heating

Applications manual 11.2007

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Contents Applications manual Table of Contents Introduction Sizing tankless water heaters Sizing by ChartDefinitions Rule of thumb sizingGas Appliance Sizing Chart GWH 715 ES Installation Specifications FeaturesApplications manual GWH 715 ES Installation Clearances Installation guidelinesGWH C 800 ES Installation Specifications GWH C 800 ES Installation ClearancesGWH C 800 ES Technical Specifications Outdoor Installation for GWH 715 ES GWH C 800 ESDescription Min Distances GWH 345 ESR Installation Specifications GWH 450 ESR Installation ClearancesGWH 345 ESR Technical Specifications GWH 450 ESR Technical Specifications GWH 450 ESR Installation SpecificationsGWH 425 EF Installation Specifications GWH 425 EF Installation ClearancesGWH 425 EF Technical Specifications GWH 425 HN Installation Clearances GWH 425 HN Installation SpecificationsGWH 425 HN Technical Specifications Establish a one-foot rise before any elbowsGWH 425 PN Installation Specifications GWH 425 PN Installation ClearancesGWH 425 PN Technical Specifications GWH 260 PN Installation Clearances GWH 260 PN Installation SpecificationsGWH 260 PN Technical Specifications Maximum flow rate at given temperature rise Technical SpecificationsElectrical requirements Powerstream Pro RP1P, RP2P, RP3P, RP7P, RP9P,RP12PT Ariston Pro GL2.5Ti, GL4Ti, GL8Ti Point-of-use applications Potable waterIntroduction Service valve Temperature and pressureRelief valve SinkService valve Sink Flow direction Sink Service valves Low flow Flow direction Shower Temperature and pressure relief valvePowerstream Pro RP17PT or RP27PT Service Sink valvesPowerstream Pro whole house applications Standard tub fixtureHotCold Bosch ProTankless gas water heater SymbolsHot Cold Parallel unit applications Bosch GWH 715 ES Bosch GWH C 800 ES Pressure relief valvesGWH 715 ES and GWH C 800 ES cascading Cascading unit applicationsPressure Single unit tank loading application plumbing diagram Cold water Feed DHWBosch GWH 345 ESR Bosch GWH 450 ESR ESR control Board Single Unit Tank Loading Electrical DiagramCold water Radiant space heating and DHW plumbing diagramFeed External storage tankRadiant space heating and DHW electrical diagram Radiant Space Heating and DHW Electrical DiagramFan coil space heating and DHW plumbing diagram Fan Coil Cold waterBosch GWH 345 ESR, Bosch GWH 450 ESR Fan Coil space heating and DHW electrical diagram Fan Coil Space Heating and DHW Electrical DiagramDrawing # BB OL RevA 10/07 Baseboard Space Heating and DHW Electrical Diagram Drawing # Bbaol RevA 10/07 Pkps Insulate piping Cold water feed Terminal box Back Flow preventer Baseboard Radiant PanelDrawing # EID Bbol CN revA 10/07 Descaling procedure Circulating pump Flow direction Filter Service valves Applications manual Applications manual Applications manual Applications manual BBT North America Corporation