HomeMy WebLinkAboutResidential Hot Water Recirculation System Design-Final *169#6'44'6740.+0'
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Residential Hot Water Recirculation System Design
(WRSEC Compliance)
1.The primed plumbing loop includes all tubing and fittings
from the water heating source to the furthest fixture and
returning to the water heater.
2.Hot water return (HWR). The section of the primed
plumbing loop from the furthest fixture and returning to
the water heater.
a. This shall be minimum 3
4" tubing and fittings.
b. Velocity in this section of the primed plumbing loop is
not to exceed 2 ft/sec.
3. Tubing and fitting runout to fixtures from the primed
plumbing loop.
a. Requires less than 16 ounces volume.
b. 16 ounces = 13.5' total length of 1
2" PEX-a tubing.
Recommendations:
i. All branch lines from main recirculation loop to
fixture shall be 1
2" PEX-a.
ii.Where sizing allows 2 hot water fixtures to be
served by a single 1
2" branch line, the maximum of 13.5 linear ft
applies to each fixture independently.
4. Recirculation pump as required by authority having
jurisdiction.
Conditions:
x All tubing is PEX-a and all fittings meet ASTM F1960
standard (expansion) to the point of termination at fixtures.
x Hot water distribution pipe sizing to conform to accepted
Washington State and local code requirements.
SAMPLE LAYOUT