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Qhp = 1.1 x PWTD x Length x T9 Factor

Where:

 

 Qhp                        = Hot water piping load, Btuh
 PWTD                        = Hot water temperature - air temperature, °F
 Length                        = Length of pipe, ft
 T9 Factor                = Factor from Table 9, Manual J 8, dimensionless
 

Ref: Manual J 8 - Page 3-6