Circulating Hot Water Systems Residential General Audiences
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The Online Code Environment and Advocacy Network Navigating the World of Energy Codes | www.bcap-ocean.org
Circulating Hot Water Systems | Residential | General Audiences Summary Circulating hot water systems distribute hot water to faucets on a “closed loop” system that circulates the water to deliver it on demand. The 2009 IECC mandates a minimum of R-2 insulation for piping in circulating hot water systems. The code also stipulates an “automatic or readily accessible manual switch” that controls the hot water circulation pump.
Current Code The 2009 IECC covers circulating hot water systems in Section 403.4.
QUICK FACTS Circulating Hot Water System –Section 403.4 2009 IECC Minimum of R-2 insulation covering pipes Mandatory for all climate zones Manual switch installed in a readily accessible area Detailed information can be found at:
Previous Code The 2009 iteration of the IECC emphasizes that a manual control must be “readily accessible.” The language in the 2003 IECC, however, is slightly vaguer, stating in Section 504.4 “Hot Water System Controls” that circulating hot water system pumps or heat trace must be “arranged to be conveniently turned off” either automatically or manually.
High Efficiency Water Heaters from Energy Star Re-circulating system in PNNL glossary Hot Water Recirculation Systems from Toolbase.org Energy-efficient water heating from Bob Vila
Exemptions Requirements covered in the 2009 IECC Section 403.4 are mandatory for all climate zones.
Requirements All parties must be aware of the requirements covered in the 2009 IECC and need to ensure that: A minimum or R-2 insulation is installed around the pipes A manual switch in an easily accessible area is installed Figure 1: Circulating Hot Water Pump
Typical Problems Standard issues/concerns that arise include: Not notifying building tenants of manual pump switch Not informing clients of energy savings features of manual switch
BCAP
OCEAN is an online resource of the Building Codes Assistance Project 1850 M St. NW Suite 1050 | Washington, DC 20036 | www.bcap-ocean.org
Circulating Hot Water Systems | Residential | General Audiences Summary Circulating hot water systems distribute hot water to faucets on a “closed loop” system that circulates the water to deliver it on demand. The 2009 IECC mandates a minimum of R-2 insulation for piping in circulating hot water systems. The code also stipulates an “automatic or readily accessible manual switch” that controls the hot water circulation pump.
Current Code The 2009 IECC covers circulating hot water systems in Section 403.4.
QUICK FACTS Circulating Hot Water System –Section 403.4 2009 IECC Minimum of R-2 insulation covering pipes Mandatory for all climate zones Manual switch installed in a readily accessible area Detailed information can be found at:
Previous Code The 2009 iteration of the IECC emphasizes that a manual control must be “readily accessible.” The language in the 2003 IECC, however, is slightly vaguer, stating in Section 504.4 “Hot Water System Controls” that circulating hot water system pumps or heat trace must be “arranged to be conveniently turned off” either automatically or manually.
High Efficiency Water Heaters from Energy Star Re-circulating system in PNNL glossary Hot Water Recirculation Systems from Toolbase.org Energy-efficient water heating from Bob Vila
Exemptions Requirements covered in the 2009 IECC Section 403.4 are mandatory for all climate zones.
Requirements All parties must be aware of the requirements covered in the 2009 IECC and need to ensure that: A minimum or R-2 insulation is installed around the pipes A manual switch in an easily accessible area is installed Figure 1: Circulating Hot Water Pump
Typical Problems Standard issues/concerns that arise include: Not notifying building tenants of manual pump switch Not informing clients of energy savings features of manual switch
BCAP
OCEAN is an online resource of the Building Codes Assistance Project 1850 M St. NW Suite 1050 | Washington, DC 20036 | www.bcap-ocean.org
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