Bosch C1210ES Instructions for use

THERM Tankless Water Heaters

Applications Manual

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual

Data subject to change without notice | 01.2011BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual | 3

Table of Contents

1 Introduction 4

2 Bosch THERM Model Certiﬁcations 4

3 Tankless Water Heater Accessories 5

4 Water Quality 6

5 Pump Sizing 7

5.1 Pressure drop curves 7

5.2 Domestic hot water circulation 8

5.3 Tank loading 8

6 Water Heater Sizing & Speciﬁcations 9

6.1 Sizing tankless water heaters 9

6.2 Bosch tankless water heater speciﬁcations 11

7 Outdoor Installation 13

8 Domestic Water Heating Applications 14

8.1 Low volume applications 15

8.2 Whole house applications 16

9 High Volume Potable Water Heating 20

9.1 Cascading unit applications 20

9.2 Parallel unit applications 23

10 Residential Solar Applications 24

10.1 Tankloading 24

10.2 Booster applications 25

11 Commercial Solar Applications 27

12 Commercial Water Heating Applications 28

12.1 Commercial kitchen applications 28

12.2 Basic tank loading with domestic recirculation 30

12.3 Advanced tank loading commercial hot water system 31

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual

1 Introduction

This Applications Manual is intended to present some of the most

common applications of the Bosch Therm 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 contrac-

tor 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 manual 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

Z223.1/NFPA 54.

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

INSTALLATION CODES and/or local installation codes.

2 Bosch THERM Model Certiﬁcations

The following are certiﬁcation stamps and explanations that are

speciﬁc to one or more Bosch tankless water heaters. These

certiﬁcations bring the appliances in accordance with the

requirements of the National Fuel Gas Code ANSI Z223.1/NFPA 54.

Certiﬁed to applicable U.S. standards for

appliances using gas or other petroleum fuel.

Certiﬁed to applicable Canadian standards for

appliances using gas or other petroleum fuel.

Certiﬁed by Underwriters Laboratories Inc.

Energy efﬁciency certiﬁed by Gas

Appliance Manufacturers Association

(GAMA), www.gamanet.org

For Models GWH C 920 ESC and C 1210 ESC only.

These models are built in accordance with the

requirements of the ASME Boiler and Pressure

Vessel Code and received the Certiﬁcate of

Authorization from the National Board. The heat

exchanger has the NB and the HLW stamps.

Plumbing-Heating-Cooling Contractors

Association

Other certiﬁcations:

Met the California Energy Commission (CEC) standards

Approved by the Commonwealth of Massachusetts

South Coast Air Quality Management

Data subject to change without notice | 01.2011BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual | 5

3 Tankless Water Heater Accessories

Available accessories Table 1

C 1210 ES/

C 1210 ESC C 1050 ES 940 ESO 940 ES 830 ES

Concentric Vent/air Intake kit - stainless steel

(part# ESHCK)√√

Concentric termination kit - PVC

(part# 196016)√√

Exhaust / intake bird screen

(part# L2594)√√ √√

Vertical vent kit

(part# ESVVT)√√

Horizontal vent kit

(part# 4TWHVK3SII)√√

Outdoor kit

(part# BTOK)√√ √√

Wireless remote control

(part# TSTAT2)√√√√√

Cascading kit

(part# 77090003962)√√√√√

External water ﬁlter

(part# 8703305356)√√√√√

Gas conversion kit

(part# 8719002176)√√√√√

Pipe cover

(part# PTPCES)√√ √√

High temp kit

(part# 7736500074)√√√√

Recess box kit

(part# 7736500043)√√√√√

Pressure relief valve

(part# FWL-2)√√√√√

PVC Condensate drain tee

(part# 196061)* √√

Condensate neutralization cartridge kit

(part# JM-2KIT)√√

* Also included in the Concentric termination kit (part# 196016)

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual

Available accessories continued Table 2

660 EF 660 EFO 520 HN 520 PN 330 PN

Pipe cover

(part# BPCKIT)√√

Remote control - for U.S.A

(part# BRC01US) √√

Remote control - for Canada

(part# BRC01CA) √√

Remote controller outdoor junction box

(part# BOJB) √√

Remote controller cord 10ft (3m)

(part# BRC10CORD) √√

Remote controller cord 26ft (8m)

(part# BRC26CORD) √√

Isolation valves - pressure relief valve included

(part# 9260LA)√√

Pressure relief valve

(part# FWL-2)√√√√√

Freeze prevention kit

(part# (7709003775) √√

4 Water Quality

Poor water quality will have an impact on appliance longevity and

may void the manufacturer’s warranty. For water analysis data call

your local water department, or if on a well, have well water

analyzed periodically. If water quality exceeds one or more of the

values speciﬁed below, Bosch recommends consulting a local water

treatment professional for water softening/conditioning options.

Water quality max. levels Table 3

Description Max. Levels

pH pH 6.5 - 8.5

TDS (Total Dissolved Solids) mg/l or ppm 500

Total hardness mg/l or ppm 100 (6 grains)

Aluminum mg/l or ppm 2.0

Chlorides mg/l or ppm 250

Copper mg/l or ppm 1.0

Iron mg/l or ppm 0.3

Manganese mg/l or ppm 0.05

Zinc mg/l or ppm 5.0

Data subject to change without notice | 01.2011BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual | 7

5 Pump sizing

The following section outlines sizing pumps for domestic hot water

circulation and tank loading. Only models approved for such

applications are listed in this section.

Pump must be bronze or stainless steel.

Size the pump according to the system pressure drop chart

below.

Maximum flow allowed through the recirc loop is 5 GPM.

If the water heater is used within an approved hot water

recirculation application and supplied with circulated

water, the heat exchanger warranty is decreased. Please

refer to the installation manual for detailed warranty

period information.

Run the system for 30 minutes to remove debris from the

plumbing. Then remove the unit‘s inlet water ﬁlter to

decrease pressure drop through the system.

If the inlet water ﬁlter, when removed, contains debris

install a Y-strainer (installer supplied) on the cold water

inlet.

5.1 Pressure drop curves

0.50.40.30.20.10.0

Flow

(

GPM

)

Pressure (Feet of Head)

C 800 ES,

C 1050 ES

C 920 series,

C 1210 series

2400 ES,

2700 ES,

GWH 715 ES,

830 ES,

940ES/ESO

660 EF/EFO

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THERM Tankless Water Heater Applications Manual

5.2 Domestic hot water circulation

 Must provide a recirculation flow above 1.7 GPM. This can be

verified in the control unit diagnostics section of the installation

manual; mode P4 – 3d.

Note: The Grundfos model 15-55 has been tested and shown to

work on recirculating systems up to 120 feet of total pipe length.

System conditions vary and each pump must be sized by a profes-

sional to insure performance.

Refer to pump manufacturers flow vs pressure specifications to

select a pump that can provide the flow rate greater than 1.7 gpm

while overcoming the pressure loss through:

• Tankless water heater (see Chapter 6.1)

• All building supply and return plumbing in the circulation loop

(reference local plumbing codes, standards, or practices)

System pressure drop

Pressure drop ¾" copper (PSI)

90 degree elbow 0.088

45 degree elbow 0.053

10 ft of straight pipe ½" 1.3

10 ft of straight pipe ¾" 0.35

Source: International Plumbing Code 2003 edition.

Examples:

1) Average house (less than 2500 square feet)

a) Total loop length approximately 120 ft

b) Pump recommendation: Grundfos UP 15-55 or equivalent.

2) Large house (2500 to 5000 square feet)

a) Total loop length approximately 240 ft

b) Pump recommendation: Grundfos UP 25-64 or equivalent.

NOTE: Use only bronze or stainless steel pumps. Do not use pumps

of iron construction as they will oxidize and clog the inlet ﬁlter on

the appliance.

Recommendations for domestic hot water recirculation

An Aquastat, with a 5° F differential to control the pump, is

recommended.

The usage of a timer is recommended to limit the energy

consumption. The timer should also limit recirculation pump

operation to the time of day when occupants are home and likely

to use hot water.

Water heater set point must be minimum of 14° F above the

Aquastat setpoint.

Example: Tankless water heater setpoint = 122°F

Aquastat setpoint = 108°F

Keep hot water piping insulated to limit heat loss.

Set temperature on the C 1210 ESC must not exceed 140°F.

5.3 Tank loading

Pressure drop vs. ﬂow

# of

units

Pressure drop vs. ﬂow

Models: C1050ES,

C1210ES, C1210ESC

Pressure drop vs. ﬂow

Model: 940ES/ESO

1 4gpm @ 40 feet of head 4gpm @ 32 feet of head

2 8gpm @ 40 feet of head 8gpm @ 32 feet of head

3 12gpm @ 40 feet of head 12gpm @ 32 feet of head

4 16gpm @ 40 feet of head 16gpm @ 32 feet of head

These guidelines should be followed to maximize system output:

•Ensure ﬂow through each water heater is between 3.5-5.0 gpm

•Isolation valves or boiler drains should installed to facilitate

descaling in applications with hard water.

•Whenever possible, plumb the system or conﬁgure the tank to

draw cold supply water into the water heater during hot water

use.

We recommend Grundfos UP26-99, Taco 009 or equivalent potable

water circulators for single unit tank loading installations.

Data subject to change without notice | 01.2011BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual | 9

6 Water Heater Sizing & Speciﬁcations

This section describes the water heaters available from Bosch

Thermotechnology Corporation and provides a general overview to

the speciﬁcations of that particular model. More detailed

information is contained in the installation manuals. Download

these manuals at www.BoschPro.com.

6.1 Sizing tankless water heaters

Deﬁnitions

Major applications (2 GPM or more): Washing machine, bath tub,

shower nozzle

Minor applications(2 GPM or less): Low ﬂow shower head, bath-

room sink, kitchen sink

Rule of thumb sizing

The tables below provide a general rule of thumb when sizing for

most residential applications. For commercial applications or for a

more detailed sizing method, use the Sizing by Chart instructions

below in conjunction with the charts on the next page.

Rule of Thumb Sizing

Model Number Number of Major

Applications

Number of Minor

Applications

C 1210 ES/ESC 3 1

C 1050 ES 2 1

940 ES/ESO 2 0

830 ES 1 2

660EF/EFO 1 1

520 HN/PN 1 0

330 PN 0 1

Sizing by Chart

Measure the ﬂow rates at each ﬁxture that will be used

simultaneously and add them together. If only one application will

be used at a time measure each ﬁxture and use the maximum ﬂow

rate observed

Using a known volume container, record several ﬁll times. Per-

form the calculation below to determine the ﬂow rate (a one

gallon ﬁll time of 30 seconds is 2.0 gallons per minute (GPM):

Flow rate (GPM) = Volume (gallons)

Fill time (sec)

sec

min

Using a thermometer, measure the incoming water temperature.

For reference, see average ground water temperature map. Sub-

tract this temperature from the desired hot water temperature to

get the degree rise. If the desired hot water temperature is 120F

and incoming temperature is 55F, the desired degree rise is 65F.

Figure 1 Average ground water temperatures

EXAMPLE:

• Required ﬂow rate of 2.0 GPM at a 65˚F rise.

• Refer to the graphs on the following page.

• Since the demand is above the 330 PN capacity, this application

would require a 520 HN/PN gas tankless water heater.

•

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION

THERM Tankless Water Heater Applications Manual

520 PN/HN

330

10 20 30 40 50 60 70 80 90

Degree rise (°F)

GPM

Gas Appl

ance S

Char

940 ES

ESO

C 1050 E

C 1210 ES

830

660 EF

EFO

• Flows above 10 GPM assume installation of a mixing valve to

help mitigate pressure drop in the water heater and plumbing

system

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