Bosch Appliances GWH 425 PN/HN4GWH 4254, GWH 260 PN/HN2 Temperature and pressure relief valve

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Applications manual	21

3.1.3Bosch GWH-260PN gas tankless water heater The Bosch GWH-260PN gas tankless water heater offers a compact and lightweight design for easy installation. This unit is equipped with standing pilot ignition and is intended for low volume applications.

Bosch GWH 260 PN

BOSCH

Symbols

Temperature and pressure relief valve

hot

cold

Sink	Service valves

Low flow	Flow direction
shower

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 # POU3

CN rev 06/07

Bosch Water Heating

Applications manual 11.2007

Image 21

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