Model GL indirect-fired water heaters — Product Manual
Recirculation
(continued)
Time lag to obtain hot water at fixture for branch lengths of 10 and 25 feet
(ASPE Domestic Water Heating Design Manual)
Copper pipe ½” 25 63 8 21 5 13 3 8
¾” 48 119 16 40 10 24 6 15
Steel pipe ½” 63 157 21 52 13 31 8 20
¾” 91 228 30 76 18 46 11 28
CPVC pipe ½” 64 159 21 53 13 62 8 20
¾” 95 238 32 79 19 48 12 30
NOTE: Select branch size and length for less than 31 seconds delay.
Recirculation components
Part number GL-E224-ADOC 0413
9
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