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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.
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
P2 |
P1 |
Cold water | DHW |
feed |
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Bosch GWH 345 ESR,
Bosch GWH 450 ESR
PS
Symbols
Potable water | Pressure | Flow | Radiant | Storage |
piping | tank | |||
expansion tank | relief | direction |
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| valve |
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Bronze circulator | Thermostatic | Service | 12K ohm |
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sized according to | thermistor |
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mixing | valves |
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UPC standards | with immersion |
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valve |
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| well |
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Note: Piping to fixtures not shown for clarity purposes.
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
Application manual 11.2007 | Bosch Water Heating |