Weil-McLain GL-E223-ADOC 0311 manual Recirculation continued, Recirculation components

AQUA PLUS indirect-fired water heaters — Product Manual

Recirculation (continued)

Figure 4 Time lag to obtain hot water at fixture for branch lengths of 10 and 25 feet (ASPE Domestic Water Heating Design Manual)

Time in seconds required to get hot water at fixture (from ASPE)

Fixture flow rate (GPM) -			0.5			1.5			2.5			4.0
Piping length (feet) -		10		25	10		25	10		25	10		25
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.

Figure 5 Recirculation components

Part number GL-E223-ADOC 0311 9