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112 ASPE Plumbing Engineering Design Handbook — Volume 2
Th = 110°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)110 105 100 95
45 1.00 0.92 0.85 0.77 50 1.00 0.92 0.83 0.75 55 1.00 0.91 0.82 0.73 60 1.00 0.90 0.80 0.70 65 1.00 0.89 0.78 0.67
Th = 120°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)120 115 110 105 100 95
45 1.00 0.93 0.87 0.80 0.73 0.6750 1.00 0.93 0.86 0.79 0.71 0.6455 1.00 0.92 0.85 0.77 0.69 0.6260 1.00 0.92 0.83 0.75 0.67 0.5865 1.00 0.91 0.82 0.73 0.64 0.55
Th = 130°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)130 125 120 115 110 105 100 95
45 1.00 0.94 0.88 0.82 0.76 0.71 0.65 0.5950 1.00 0.94 0.88 0.81 0.75 0.69 0.63 0.5655 1.00 0.93 0.87 0.80 0.73 0.67 0.60 0.5360 1.00 0.93 0.86 0.79 0.71 0.64 0.57 0.5065 1.00 0.92 0.85 0.77 0.69 0.62 0.54 0.46
Th = 140°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)140 135 130 125 120 115 110 105 100 95
45 1.00 0.95 0.89 0.84 0.79 0.74 0.68 0.63 0.58 0.5350 1.00 0.94 0.89 0.83 0.78 0.72 0.67 0.61 0.56 0.5055 1.00 0.94 0.88 0.82 0.76 0.71 0.65 0.59 0.53 0.4760 1.00 0.94 0.88 0.81 0.75 0.69 0.63 0.56 0.50 0.4465 1.00 0.93 0.87 0.80 0.73 0.67 0.60 0.53 0.47 0.40
Th = 150°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)150 145 140 135 130 125 120 115 110 105 100
45 1.00 0.95 0.90 0.86 0.81 0.76 0.71 0.67 0.62 0.57 0.5250 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.5055 1.00 0.95 0.89 0.84 0.79 0.74 0.68 0.63 0.58 0.53 0.4760 1.00 0.94 0.89 0.83 0.78 0.72 0.67 0.61 0.56 0.50 0.4465 1.00 0.94 0.88 0.82 0.76 0.71 0.65 0.59 0.53 0.47 0.41
Th = 160°F Hot Water System Temperature
Tc, CW Temp. (°F)
Tm, Water Temperature at Fixture Outlet (°F)160 155 150 145 140 135 130 125 120 115 110
45 1.00 0.96 0.91 0.87 0.83 0.78 0.74 0.70 0.65 0.61 0.5750 1.00 0.95 0.91 0.86 0.82 0.77 0.73 0.68 0.64 0.59 0.5555 1.00 0.95 0.90 0.86 0.81 0.76 0.71 0.67 0.62 0.57 0.5260 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.5065 1.00 0.95 0.89 0.84 0.79 0.74 0.68 0.63 0.58 0.53 0.47
Table 6-4 Hot Water Multiplier, P
