American Water Heater GTS-705-NIA User Manual

23

Domestic Hot Water - Circulation Systems

3 Tankless Water Heaters with Gas or Electric Tank

Preferred Piping Installation

Drawing Number:

Drawing Date:

Pres

s

ure R

e

lief

 Valv

e

3/

4"

 Ball 

Valv

e

3/

4"

 U

n

ion

C

h

ec

k Valv

e

Ke

y

S

Pres

s

ure R

egulat

or

C

irc

ulat

ing Pum

p

Solenoid Valv

e

Boiler D

rain Valv

e

WH-3-RGE

February 27, 2008

This is not an engineering drawing; it is intended only as a guide and not 

as a replacement for professional engineering project drawings.  

This 

drawing is not intended to describe a complete system.  It is up to the 

contractor or engineer to determine the necessary components and 

configuration of the particular system to be installed.  

The drawing does 

not imply compliance with local building code requirements.  It is the 

responsibility of the engineer or contractor to ensure that the installation is 

in accordance with all local building codes.  Confer with local building 

of

ficials before installation.

Gas Supply

C

o

ld

W

a

te

r

S

u

p

p

ly

L

in

e

Hot

 Water Supply Line

Smaller Return Line 

Can Be Used After 

The Last Fixture

Expansion Tank

(Optional) Header Sized One Pipe 

Size Larger Than Hot 

Water Supply Line - (

To e

liminate c

old 

water

 sa

ndwic

h effec

t 

cau

s

ed b

y

 frequ

ent 

On/Off op

eration)

  

Gas or Electric 

Tank Water 

Heater

Tank Water Heater sized to 

maintain circulation loop 

temperature

Building Outlets

Pump should be controlled by an 

Aquastat, 

T

imer or Combination 

Aquastat and 

T

imer

.

Pump to be sized to maintain circulation 

loop temperature.

The pump should be sized to overcome the 

pressure loss through the tank water heater

, 

and supply and return plumbing in the 

circulation loop.  Reference the section 

.

Pump to be of bronze or stainless construc-

tion.

A

quastat C

onnec

tion

Tankless

Equipment List 

QTY

Tankless 3

W

a

ter Heaters

Electronic Connection *

* Refer to Tankless Accessories 

  and Model 

Applicability for

  electronic connection details.