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Table S-3 — Correction Factors for Non-Standard Average Water Temperatures
Average Entering Air Temperature
Water Temp. 45°F50°F55°F60°F65°F70°F75°F80°F85°F
(F) (C) 7°C10°C13°C16°C18°C21°C24°C27°C29°C
170 77 .82 .77 .72 .67 .61 .57 .53 .48 .44
180 82 .91 .86 .81 .75 .69 .65 .61 .56 .52
190 88 1.00 .94 .89 .84 .78 .73 .69 .64 .60
200 93 1.09 1.03 .97 .92 .86 .81 .77 .72 .68
210 99 1.18 1.12 1.06 1.01 .95 .90 .85 .80 .76
220 104 1.27 1.21 1.15 1.09 1.05 .98 .93 .88 .84
230 110 1.37 1.30 1.24 1.19 1.14 1.08 1.03 .98 .93
240 116 1.47 1.41 1.35 1.29 1.25 1.17 1.12 1.07 1.02
250 121 1.57 1.50 1.44 1.38 1.32 1.26 1.20 1.15 1.10
260 127 1.67 1.60 1.52 1.46 1.40 1.34 1.29 1.24 1.20
270 132 1.78 1.70 1.62 1.56 1.50 1.44 1.39 1.34 1.29
280 138 1.88 1.80 1.72 1.66 1.60 1.54 1.48 1.43 1.38
290 143 1.98 1.90 1.82 1.75 1.69 1.63 1.58 1.52 1.48
300 149 2.08 2.00 1.92 1.85 1.79 1.73 1.67 1.62 1.57
NOTE: To determine capacity of non-standard conditions, multiply the corresponding factor above by the BTU (Watts/
meter) steam rating found on pages 13-37.
Table S-4 — Factors Used to Convert 1 PSI
Steam Ratings to Hot Water Ratings at
Temperatures Indicated
Average Water Temperature Correction
(F) (C) Factor
100°F38°C0.15
110°F43°C0.20
120°F49°C0.26
130°F54°C0.33
140°F60°C0.40
150°F66°C0.45
155°F68°C0.49
160°F71°C0.53
165°F74°C0.57
170°F77°C0.61
175°F79°C0.65
180°F82°C0.69
185°F85°C0.73
190°F88°C0.78
195°F91°C0.82
200°F93°C0.86
205°F96°C0.91
210°F99°C0.95
215°F 102°C1.00
220°F 104°C1.05
225°F 107°C1.09
230°F 110°C1.14
235°F 113°C1.20
240°F 116°C1.25
Note: To determine capacity at non-standard conditions,
multiply the corresponding factor above by the BTU
(Watts/meter) steam rating found on pages 13-37.
*The weight of a U.S. gallon of water at
60°F is 8.33 pounds. At a flow rate of
1 U.S. gpm, the weight of the water
circulated through the system in one
hour is 1.0 x 8.33 multiplied by 60 minute
= 500 pounds.