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Applications manual
Application manual | 11.2007
Bosch Water Heating
5 Open Loop Space Heating
Introduction
This section is designed to provide a road map of techniques for
using a tankless water heater to heat domestic water and at the
same time provide space heating in residential applications. As with
all installations, check with the local authority having jurisdiction.
Some jurisdictions may not allow these types of applications.
Symbols
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 # ROL
CN revA 10/07
Service
valves
Bronze circulator
sized according to
UPC standards
Potable water
expansion tank
Flow
direction
Note: Piping to fixtures not shown for clarity purposes.
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
Cold water
feed
DHW
Pressure
relief
valve
Storage
tank
P1
P2
PS
Thermostatic
Thermostatic
mixing
mixing
valve
valve
Radiant
piping
12K ohm
thermistor
with immersion
well
5.1 External storage tank
The appliances shown in this section are approved under ANSI
Z21.10.3 and CSA 4.3 as circulating gas water heaters. Only open
loop applications are approved under this standard.
5.1.1 Radiant space heating and DHW plumbing diagram