Bosch Appliances GWH 425 PN/HN4GWH 4254, GWH 260 PN/HN2 manual Introduction

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Applications manual

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1 Introduction

The Bosch Applications Manual is intended to present some of the most common applications of the Bosch line of tankless and point of use water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. Auxiliary equipment depicted does not necessarily represent any one manu- facturer 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.

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 Water Heating.

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) INSTAL- LATION CODES and/or local installation codes.

2 Bosch Water Heating Models

This section describes the water heaters available from Bosch Water Heating. The information given in each section provides a general overview to the specifications of that particular model. More detai- led information is contained in the installation manuals. Download these manuals at www.BoschPro.com.

Bosch Water Heating

Applications manual 11.2007

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Contents Applications manual Table of Contents Introduction Rule of thumb sizing Sizing by ChartSizing tankless water heaters DefinitionsGas Appliance Sizing Chart Installation guidelines FeaturesGWH 715 ES Installation Specifications Applications manual GWH 715 ES Installation ClearancesGWH 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 Establish a one-foot rise before any elbows GWH 425 HN Installation SpecificationsGWH 425 HN Installation Clearances GWH 425 HN Technical SpecificationsGWH 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 Sink Temperature and pressureService valve Relief valveService valve Sink Flow direction Sink Service valves Low flow Flow direction Shower Temperature and pressure relief valveStandard tub fixture Service Sink valvesPowerstream Pro RP17PT or RP27PT Powerstream Pro whole house applicationsHotCold 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 DiagramExternal storage tank Radiant space heating and DHW plumbing diagramCold water FeedRadiant 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