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Copper Tubes - Heat Losses

Heat loss from uninsulated copper tubes vs. temperature differences between tube and air.

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Values from the table below can be used to indicate the heat losses from uninsulated copper pipes:

Copper Tubes - Heat Losses
Nominal boreHeat Loss
(W/m)(Btu/hr ft)
Temperature difference (oC)Temperature difference (oF)
(mm)(inches)223855406899
15 1/2 21 32 45 22 34 47
22 3/4 28 43 60 29 45 53
28 1 34 53 76 36 56 79
35 1 1/4 41 64 89 43 67 93
42 1 1/2 47 74 104 49 77 108
54 2 59 93 131 62 97 136
67 2 1/2 71 111 156 74 116 162
76 3 83 129 181 87 135 189
108 4 107 165 232 111 172 241
  • 1 W = 3.4 Btu/hr
  • 1 ft (foot) = 0.3048 m

Copper Tubes - Uninsulated heat loss

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